Posted on June 1, 2024June 1, 2024 by Abate TadesseModel Exit Exam for BSc in Statistics, 2016 0 votes, 0 avg 65 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120 Model Exit Exam for BSc in Statistics at Salale University, 2016 E.C The Model Exit Exam Has 120 Multiple Choose Questions. Please try to answer all questions ! Name of StudentID NumberModality (egular, Extention or Weekend)Phone Number 1 / 120 1) ___is the study of the childbearing performance of individuals, couples, groups, and populations. A) Mortality B) Fecundity C) Fertility D) Migration Demography 2 / 120 2) To assign a value 1, 2 , 3,4,5, 6 and 7 to a variable x in R, which one of the following is the correct assignment? A) x<-c(1,2,3,4,5,6,7) B) x ==c(1,2,3,4,5,6,7) C) x = data(1,2,3,4,5,6,7) D) None Statistical Computing II 3 / 120 3) Which one of the following r commands is correct to conduct two sample t-tests (or independent-samples T-test), by assuming equal population variance? A) t.test(x,y, pair =TRUE) B) T.test(x, y, var.equal=TRUE) C) t.test(x, y, var.equal=T) D) t_test(x, y, var.equal=TRUE Statistical Computing II 4 / 120 4) One of the following is/are properties of R software : A) It is free & easy to learn. B) R has an excellent built-in help system. C) R has excellent graphing capabilities. D) All Statistical Computing II 5 / 120 5) Which one of the following r commands is correct to conduct two sample t-tests A) anova ( ) B) aov ( ) C) var( ) D) lm( ) Statistical Computing II 6 / 120 6) Which one of the following r codes can be used to draw 100 random numbers from a poisson distribution with lamda 4? A) rpois(100,4) B) rPoiss(100,4) C) rpoiss(100,4) D) rpoi(4, 100) Statistical Computing II 7 / 120 7) Which one of the followings is used for writing as well as executing commands on r software? A) Script B) Console C) File D) Work space/Environment Statistical Computing II 8 / 120 8) Which function is used to create the vector with more than one element? A) Library() B) plot() C) c() D) par() Statistical Computing II 9 / 120 9) One of the following is considered as a menu in SPSS software A) Data B) Analysis C) Edit D) All Statistical Computing I 10 / 120 10) One of the following is considered as the most commonly used editing techniques of SPSS outputs A) Editing and altering texts B) Changing column width C) copy and paste to other file type D) All Statistical Computing I 11 / 120 11) Which one of the following is true? A) All coded qualitative variables should have value labels. B) All Continuous variables should have value labels. C) All Numeric Variables should have value labels. D) All quantitative variables should have value labels. Statistical Computing I 12 / 120 12) Which one of the following is not true about levels of measurement on SPSS A) The default for string variables is Nominal B) The default for numeric variables is Scale C) SPSS does differentiate between interval and ratio levels D) Nominal and ordinal levels of measurement are differentiated Statistical Computing I 13 / 120 13) If someone is interested to consider females only under variable gender for analysis,which menu will be used to do so? A) Analysis then data B) Data then Select Cases C) Select Cases then Sort D) Data then Sort Statistical Computing I 14 / 120 14) Which of the following is true about a Data Editor window on SPSS A) Used to create new data files or modify existing ones B) Opens automatically when you start SPSS. C) It displays the contents of the current (working) data file. D) All Statistical Computing I 15 / 120 15) Which one of the following is True about varaible naming in SPSS software: A) The variable name may not be unique B) The variable name must not start with number and special character C) The variable name may contain space and special character D) All Statistical Computing I 16 / 120 16) _____is the average number of children that would be born to a woman by the time she ended childbearing if she were to pass through all her childbearing years conforming to the age-specific fertility rates of a given year. A) Gross reproduction rate B) Total fertility rate C) Net Reproduction rate D) Crude Birth rate Demography 17 / 120 17) Which one of the following is not true about census servey A) De jure census is the enumeration ( count) is done according to the usual/permanent or legal place of residence. B) A de jure count of the members of a household excludes temporary residents and visitors, but includes permanent residents who are temporarily away. C) De facto census is the enumeration ( count) is done according to the usual/permanent or legal place of residence. D) A de facto count includes temporary residents and visitors, but excludes permanent residents who happen to be away on the day of the census. Demography 18 / 120 18) _____is the study of the child bearing performance of individuals, couples, groups and populations. A) Mortality B) Fecundity C) Fertility D) Migration Demography 19 / 120 19) Which of the following is/are true? A) Abridged life table: life table is constructed for age intervals B) Complete life table: life table is prepared for each single year of age from birth to the last applicable age C) Constructed based on the mortality rates experienced by all persons born at some particular time. D) All of the above Demography 20 / 120 20) If we would like to consider the level of population replacement of a specific region, as well as the factors of mortality among mothers during their childbearing, we have to estimate ____ A) Crude birth rate B) Gross reproductive rate C) Net Reproductive rate D) Total fertility rate Demography 21 / 120 21) Which of these terms means “A movement of peoples from one region to another within the same country”? A) International migration B) population. C) Internal migration D) Migration rate Demography 22 / 120 22) Which one of the following is true about dependency ratio(DR)? A) It is the ratio of dependent age group of population to working age group of population B) Higher DR indicates that the more people each worker has to support C) Lower DR indicates that the fewer people are dependent D) All Demography 23 / 120 23) Which one of the following is/are true about the properties of simple logistic regression? A) If β > 0, then probability of success increases as x increases. B) If β < 0, then probability of success decreases as x increases. C) If β=0, then probability of success is independent of X. D) All of the above Categorical Data Analysis 24 / 120 24) The logistic regression model parameter is estimated by using _____ methods A) Maximum likelihood estimation B) Ordinary least square C) free hand D) All Categorical Data Analysis 25 / 120 25) Which of the fooling is not true about simple Poisson regression model that uses continuous predictor variable? A) The expected counts of the response changes multiplicatively for a unit increases for a continues predictor variable B) The expected logarithm of counts of the response changes additively for a unit increases in predictor variable C) The expected counts of the response changes additively for a unit increases in predictor variable D) β0 (intercept) is the value expected count when all predictors are zero Categorical Data Analysis 26 / 120 26) Which of the following statement is not true? A) A logistic regression model with the smaller AIC is preferred B) A logistic regression model having small value of Pseudo-R2 considered to have good fit to the data. C) A logistic regression model having larger log likelihood value considered to have good fit to the data D) All of the above Categorical Data Analysis 27 / 120 27) Suppose a health scientist has the condition of patients in some hospital rated as (serious, fair and good) as a response variable and he has the desire to regress the response to a set of patient’s characteristics. Which method is the most appropriate method? A) Binary logistic regression B) Poisson regression C) multiple linear regression D) ordinal logistic regression Categorical Data Analysis 28 / 120 28) The appropriate modelling applied for a categorical response variable with three or more categories could be ?______ A) Binary logistic regression B) Ordinal Logistic regression C) Linear regression D) Multiple Linear regression Categorical Data Analysis 29 / 120 29) Which of the following is true about goodness-of-fit for a logistic model? A) The smaller the deviance the better the fit of the logistic model B) Large p-value for goodness-of-fit test provide evidence of lack of fit C) Large Pearson’s statistic value for goodness-of-fit test provide evidence of lack of fit D) All of the above Categorical Data Analysis 30 / 120 30) Suppose a model was fitted predicting the result of entrance exam for some job (fail=1, pass=0) in SLU as a function of age (x) in years, the predicted logit equation obtained was logit (π(x))= 2+0.6age with the standard error of the coefficient=.02. For this prediction equation, A) The young are estimated to be more likely to pass the exam than the old ones. B) The old are estimated to be more likely to pass the exam than the young ones. C) Both olds and young have the same chance to pass exam D) Non of the above Categorical Data Analysis 31 / 120 31) In studying the of association between smoking status and cancer the interval (1.3, 1.5) is the 95% confidence interval of the odds ratio with respect to smoking status and lung cancer. What can one say about the true odds ratio? A) The true odds ratio could be outside of (1.3, 1.5), and the chance for this to occur is 5% B) One has 95% confidence in believing that the true odds ratio is in (1.3, 1.5) C) One can reject the null hypothesis at the significance level, 0.05, that the true odds ratio is 1 D) All of the above Categorical Data Analysis 32 / 120 32) Which of the following refers to a relatively high correlation among the independent A) Autocorrelation B) The identity problem C) Statistically insignificant regression coefficients D) Multi-collinearity Regression Analysis 33 / 120 33) In a regression analysis if SSE = 200 and SSR = 300, then the coefficient of determination is ___________ A) 0.67 B) 0.6 C) 0.4 D) 1.5 Regression Analysis 34 / 120 34) If the correlation coefficient is 0.8, the percentage of variation in the response variable explained by the variation in the explanatory variable is____________ A) 0.008 B) 0.8 C) 0.0064 D) 0.64 Regression Analysis 35 / 120 35) If two variables x and y, have a very strong linear relationship and y is considered as dependent and X be the independent variables, then ____________ A) there is evidence that x causes a change in y B) there is evidence that y causes a change in x C) there might not be any causal relationship between x and y D) None Regression Analysis 36 / 120 36) If there is non-linear relationship between the corresponding repressor’s (independent variables x’s) and the response variable (Y) and undesirable residual pattern occur, then the appropriate method to correct it can be: A) Transform xj or y into another form B) Add a high order term(s) of xj to the model C) Include a new regressor(s) in the model D) All Regression Analysis 37 / 120 37) Which one of the following is true about Heteroskedasticity and residual in regression, respectively ? A) Linear Regression with varying error terms and mean residual always zero B) Linear Regression with constant error terms and mean residual less than one C) Linear Regression with zero error terms and mean residual greater than zero D) All Regression Analysis 38 / 120 38) In regression analysis, the variable that is being predicted is the __________ A) response, or dependent, variable B) independent variable C) intervening variable D) is usually x Regression Analysis 39 / 120 39) One of the following is an analysis method used to model the relationship between one continuous dependent variable and one or more continuous or discrete independent variables A) Linear regression model B) Multinomial Logistic regression C) Binary Logistic regression D) Count Regression Regression Analysis 40 / 120 40) Regression modelling is a statistical framework for developing a mathematical equation that describes how __________ A) One explanatory and one or more response variables are related B) several explanatory and several response variables are related C) One response and one or more explanatory variables are related D) All Regression Analysis 41 / 120 41) Moving average method isused for measurement of trend when________ A) Trend is Linear B) Trend is non-linear C) Trend is curvilinear D) All Time series Analysis 42 / 120 42) A time series model has fitted to some historical data and yielding Yt = 25+0.34Yt-1 + εt. Suppose that at time T=100, the observation is Y100 = 28, then what is the forecasts for periods 101? A) 34.52 B) 34 C) 35.72 D) 37.02 Time series Analysis 43 / 120 43) Identify the wrong statment A) Stationarity of data is a fundamental requirement for time series analysis B) MA processes are always stationary C) AR and ARMA processes are generally not stationary unless appropriate restrictions are imposed on the model parameters D) AR models are called short memory models. Time series Analysis 44 / 120 44) Which of the following Forecasts can be made on a basis using judgment, intuition, commercial knowledge and any other relevant information? A) Subjective B) Univariate C) Multivariate D) All Time series Analysis 45 / 120 45) Which of the following is a common technique for estimating the trend component in a time series with seasonality? A) Seasonal Adjustment B) Deseasonalization C) Seasonal Decomposition D) Seasonal Smoothing Time series Analysis 46 / 120 46) Which of the following is a common method for detecting seasonality in a time series? A) Partial autocorrelation function (PACF) B) Autocorrelation function (ACF) C) Augmented Dickey-Fuller test D) Dickey-Fuller test Time series Analysis 47 / 120 47) Any regular fluctuations with a period of less than one year are called___ A) Cyclical variation B) Irregular variation C) Seasonal variation D) Long term variation Time series Analysis 48 / 120 48) The time series model has been fitted to some historical data having 100 observations asYt =εt – 0.5 εt-1.What is order of this model? A) ARMA (1, 2) B) ARMA (1, 1) C) MA (1) D) MA (2) Time series Analysis 49 / 120 49) Which of the following statements is correct? A) If autoregressive parameter (p) in an ARIMA model is 1, it means that there is no auto-correlation in the series. B) If moving average component (q) in an ARIMA model is 1, it means that there is auto-correlation in the series with lag 1. C) If integrated component (d) in an ARIMA model is 0, it means that the series is not stationary. D) None Time series Analysis 50 / 120 50) What is the primary objective of the Box-Jenkins methodology in time series analysis? A) To identify the trend component in the time series data B) To estimate the seasonal component in the time series data C) To model and forecast time series data using autoregressive integrated moving average (ARIMA) models D) To perform seasonal decomposition on the time series data Time series Analysis 51 / 120 51) Identify the method that is not used to estimate the seasonal indices in Time sereie analysis. A) Simple Average Method B) Ratio to Moving Average Method C) Ratio to trend D) Pearson method Time series Analysis 52 / 120 52) Which measure is commonly used to assess the quality of healthcare in health data analysis? A) Mortality rate B) GDP per capacity C) Gini coefficient D) Mean income Social and economic Statistics 53 / 120 53) What does the term “dropout rate” refer to in education data analysis? A) Rate of students who drop out of school before completing their education B) Rate of students who successfully complete their education C) Rate of teachers leaving the profession D) Rate of enrollment in higher education institutions Social and economic Statistics 54 / 120 54) Which measure is commonly used to analyze labor data to assess employment trends? A) Gross Domestic Product (GDP) B) Consumer Price Index (CPI) C) Infant mortality rate D) Labor force participation Social and economic Statistics 55 / 120 55) If someone lists a car or other product or service in the classifieds section of a newspaper, another consumer can buy that car directly from the seller. Which one of the following is the correct transaction? A) Business to Business B) Wholesale to Consumer C) Consumer to Consumer D) All Social and economic Statistics 56 / 120 56) An Investigators go back several decades to get the records of the factory workers from a manufacturing company. These workers could be investigated on how exposure to particular radiation from the machines affected them over the years. Which one of the following studies is correct to study this case? A) Cross sectional study B) Retrospective study C) Prospective study D) All Social and economic Statistics 57 / 120 57) A researcher wants middle-aged truck drivers who vary in terms of smoking habits, to test the hypothesis that the 20-year incidence rate of lung cancer will be highest among heavy smokers, followed by moderate smokers, and then nonsmokers. Which one of the following studies is correct to study this case? A) Cross sectional study B) Retrospective study C) Prospective study D) All Social and economic Statistics 58 / 120 58) The main types of measurement scales in Categorical or qualitative variables are __ A) Nominal and Ordinal B) Nominal and Interval C) Ratio and Interval D) Scale Basic statistics 59 / 120 59) A process that can be repeated any number of times under similar conditions and it is possible to enumerate the total number of outcomes without predicting an individual outcome A) Non-Random Experiment B) Random Experiment C) Sample D) Sample Space Basic statistics 60 / 120 60) Let we have the values of X=( 2,3,6, and 100). Then which one of the measure of central tendency is the most appropriate measure of central tendency for X. A) Mean B) Mode C) Median D) Midrange Basic statistics 61 / 120 61) If X is a random variable and takes only specific or selectecd valuse, and these values are obtained through counting is called__________ variable. A) Continuous B) Discrete C) Continuous and quantitative D) Discrete and qualitative Basic statistics 62 / 120 62) _____ is a measures which measure of the spread of data around the mean? A) Standard deviation B) Interquartile C) Median D) Mode Basic statistics 63 / 120 63) The measure of variation which gives the number of standard deviation a particular observation Lie above orbelow the mean is known as________. A) Mean deviation B) Coefficients of variation C) Standard Score D) Range Basic statistics 64 / 120 64) Which one of the following methods is an example of primary data collection ? A) Reviewing existing research papers and reports B) Analyzing data obtained from government databases C) Conducting surveys and interviews D) Extracting data from social media platforms Basic statistics 65 / 120 65) Which one of the following measures of dispersion used to make comparison in terms of the variability of two distributions which have different unit of measurement A) Mean deviation B) standard score C) Range D) Quartile devation Basic statistics 66 / 120 66) When to use two the power of three factorial design? A) It has two factors and each has three levels B) It has two factors and each factor has three replications C) It has three factors and each factor has two levels D) It has three factors and each factors has two replications design and analaysis of experiment 67 / 120 67) Which one is not the basic principle of experimental design A) Randomization B) Replication C) Confounding D) Blocking Design and Analaysis of Experiment 68 / 120 68) An engineer designing a battery for use in a device that will be subjected to some extreme variations in temperature. The only design parameter that he can select at this point is the plate material for the battery, and he has three possible choices. Temperature can be controlled in the product development laboratory for the purpose of the test. All three plate materials tested at three temperature levels (15, 70, and 125 oF), four batteries are tested at each combinations plate material and temperature, and all 36 tests are performed in random. From this information complete the ANOVA table and answer the following question.From the above problem which factor is significant effect of battery life? A) Material type B) Temperature C) Temperature interaction material type D) All Design and Analaysis of Experiment 69 / 120 69) When do we have to use factorial design? A) When there are two or more factors are examined in an experiment. B) When we want to study the joint effect of two or more factors on a response, factorial design is most efficient C) When the interaction may be present, to avoid misleading conclusions. D) All Design and Analaysis of Experiment 70 / 120 70) Why do researcher and experimenters use nested design? A) To identify the source of variability in raw material purity in the output. B) To test effect of factors. C) To make error term or random disturbance minimum D) All Design and Analaysis of Experiment 71 / 120 71) If the researcher’s interest is generalized only about the treatments involved in the experiment, then the statistical model is A) effect model B) Mean model C) Fixed effect model D) Random effect model Design and Analaysis of Experiment 72 / 120 72) If the nuisance factors are unknown and uncontrollable, then which method is used to balance their impact? A) Blocking B) Randomization C) Analysis of variance D) Analysis of covariance Design and Analaysis of Experiment 73 / 120 73) In a single factor experiment of CRD with a treatment level, the a-l treatment means pairs are compared with one of the treatment mean called control. The test procedure that compare the a-1 treatments means with control treatment mean is called____ A) Dunnett’s test B) Tukey’s testr C) Orthogonal Contrast D) LSD Design and Analaysis of Experiment 74 / 120 74) In certain multifactor experiments, the levels of one factor are similar but not identical for a different level of another factor is called ___________. A) Latin Square design B) Factorial design C) Bolock Design D) Nested Design Design and Analaysis of Experiment 75 / 120 75) The design of experiment in which the effects of the levels of a factor are considered at various levels of the other factor is ____ A) Factorial design B) Completely Randomized design C) Graeco-Latinsquare design D) Nested design Design and Analaysis of Experiment 76 / 120 76) Which on of the following statement is correct about completerly randimozed design, a single factor experiment A) The total variation in the response variable is decomposed in variation due to between treatment level and within treatment level. B) The sum of all treatment effect must be zero C) The comparison of treatment level can be tested as mean or treatment effect hypothesis test D) All Design and Analaysis of Experiment 77 / 120 77) Which one of the following is true about split-plot design? A) The levels of all the factors are randomly determined and reset for each experimental run. B) The size of the experimental unit must be same for all experimental factors. C) There is a restriction on the random assignment of the treatment combinations to the experimental units. D) All of the above Design and Analaysis of Experiment 78 / 120 78) Which one is the advantage that nonparametric methods have over parametric methods? A) They can be used when the data are nominal or ordinal. B) They can be used to test hypotheses that do not involve population parameters. C) To test population parameters when the variable is not normally distributed. D) All Statistical Method 79 / 120 79) Assume that that a researcher want to test the hypothiesis for two samples mean comparison and He/She use a 95% confidence interval for the mean diffence to decided the hypothesis. If confidence interval for the mean difference does not contain 0, then what should be the decision of the researcher based on the confidence interval? A) The null hypothesis is rejected. B) The null hypothesis is not rejected. C) No decision could be raised based on the confidence interval for the mean difference D) None Statistical Method 80 / 120 80) A non-parametric test would be used for A) When the data are continuous B) When the data are interval or ratio scales C) When the data are nominal or ordinal D) none Statistical Method 81 / 120 81) _______is a hypothesis test used to compare the mean charactersistics of a variable across more two different groups. A) One sample mean test B) Paired/matched sample test C) independent sample test D) Analysis of Variance(ANOVA) Statistical Method 82 / 120 82) Assume that a simple random sample of 25 automobile tiers was drawn from a normally distributed population of certain production run. The mean and standard deviation of the lifetime of the tiers were 2200 miles and 500 miles, respectively. A 95% confidence interval for the mean lifetime of all tiers in this production line is_____?(t.025(25) =0.6844) A) (2008.3 , 2331.7) B) (2131.56 , 2268.44) C) (2200 , 2450) D) (1700 , 2700) Statistical Method 83 / 120 83) What test can be used to test the difference between two sample means when the population variances are known? A) Z test B) F test C) T test D) Chi-square test Statistical Method 84 / 120 84) As sample size increases the values of an estimator approaches to the values of estimator this estimated is? A) Consistence estimator B) Efficient estimator C) None D) Unbiased estimator Statistical Method 85 / 120 85) Which one of the following is true about t distribution A) The variance is greater than one B) It is symmetry about mean and mode C) The curve touches x axis properly D) None Statistical Method 86 / 120 86) ___ is procedure that results in which a single values of statistic is used to estimate a parameter when the investigator doesn’t have prior information A) Point estimate B) Interval estimate C) Parameter D) Statistics Statistical Method 87 / 120 87) The null hypothesis for chi-square test for independence is that the variable are A) Dependent B) Independent C) Cross correlated D) All Statistical Method 88 / 120 88) The degrees of freedom for test goodness of fit in chi-square is___? A) The product of row minus one and column total minus one B) The sum of row total minus one and column total minus one C) Number of categories minus one D) None Statistical Method 89 / 120 89) Which of the following random variable is often referred to as a discrete waiting-time of random variable and represents how long (in terms of the number of failures) one waits for the rth success. A) Hypergeometric distribution B) Geometric distribution C) Exponential distribution D) Negative-binomial distribution Theory of distribution 90 / 120 90) Suppose X1, X1, …, Xn are random variables distributed as standard normal distribution with mean µ_i=0, and standard deviations δ_i=1 and independent, then Y =〖X^2〗_(1,)+ 〖X^2〗_2 + 〖X^2〗_3+⋯+〖X^2〗_n is will be distributed as________ A) Y is distributed as student’s t distribution with degree freedom n B) Y is distributed as standard normal distribution C) Y is distributed as chi-square distribution with degree freedom n D) All Theory of distribution 91 / 120 91) A shipment of 20 digital voice recorders contains 5 that are defective. If 10 of them are randomly chosen for inspection with replacement, what is the probability that 2 of the 10 will be defective? A) 0.348 B) 0.41 C) 0.254 D) 0.843 Theory of distribution 92 / 120 92) Suppose that the life time of certain light bulb is exponentially distributed with mean 100 bulbs. If 10 such light bulb is installed simultaneously, then,What is the expected life time of the distribution of the life of the light bulb that fails first? A) 0.1 B) 0.01 C) 10 D) 9 Theory of distribution 93 / 120 93) Let X1 and X2 be two independent standard normal random variables. Let, Y1=X1+X2 and Y2= X2-X1. Then, what is the joint distribution of Y1 and Y2? A) Y1 and Y2 has normal distribution with mean 0 and variance 1 B) Y1 and Y2 has normal distribution with mean 0 and variance 4 C) Y1 and Y2 has normal distribution with mean 1 and variance 0 D) Y1 and Y2 has normal distribution with mean 0 and variance 2 Theory of distribution 94 / 120 94) One of the following distribution is a distribution that answers the question of “how many trials needed to get the first success? A) Exponential distribution B) Negative Binomial distribution C) Geometric distribution D) Chi-square distribution Theory of distribution 95 / 120 95) The ration of two independent standard normal random variables has a………… distibution. A) Gamma B) Beta C) Cauchy D) Chi-square distribution Theory of distribution 96 / 120 96) If we have two independent chi-square random variables X and Y with degree freedom d and f, respectively. Then ratio of the chi-square distribution given by: T = (X⁄d)/(Y⁄f) is ___, A) f(t) is distributed as student’s t distribution with degree freedom d+f B) f(t) is distributed as F- distribution with degree freedom (d, f) C) f(t) is distributed as chi-square distribution with degree freedom d+f D) None Theory of distribution 97 / 120 97) A random sample of 20 observations is selected from a normally distributed population. The sample variance is 12.96. In the 95 percent confidence interval for the population variance, the upper limit will be: A) 25.620 B) 7.495 C) 8.599 D) 27.647 Statistical Inference 98 / 120 98) In Cramer-Rao Inequality var (sample statistic) is called. A) Complete B) Minimum variance bond C) Efficient D) Sufficient Statistical Inference 99 / 120 99) An estimator is UMVUE if it is unbiased, sufficient and. A) Complete B) Minimum variance bond C) Efficient D) None of these Statistical Inference 100 / 120 100) Sand is packed into bags which are then weighed on scales. It is known that if full bags of sand are intended to weigh μ kg, then the weight recorded by the scales will be normally distributed with a mean μ kg and a standard deviation of 0.36kg. A particular bag of sand was weighed four times and the weight recorded each time was different. The sample mean weight was recorded as 34.7kg. What is a 95percent confidence interval for the true weight of the full bag of sand? A) 34.35 to 35.05kg B) 35.85 to 36.55kg C) 34.21 to 35.19kg D) 34.48 to 34.92kg Statistical Inference 101 / 120 101) Which one of the statements below is correct? A) If n, the sample size, increases, the confidence interval becomes wider B) A 90 percent confidence interval for the population mean is narrower than a 95percent confidence interval for the population mean C) As the population standard deviation increases, the confidence interval becomes narrower D) If alpha = 0.01, it implies that we are 1 percent confident that the population mean will lie between the confident limit Statistical Inference 102 / 120 102) Which of the following statements is not correct? A) If the population mean and population standard deviation are both known, one can make probability statements about individual x values taken from the population B) If the population mean and population standard deviation are both known, one can use the central limit theorem and make probability statements about the means of samples taken from the population C) If the population mean is unknown, one can use sample data as the basis from which to make probability statements about the means of samples taken from the population D) when sample data are used for estimating a population mean, sampling error will not be present since the observed sample statistic will not differ from the actual value of the population parameter Statistical Inference 103 / 120 103) Inferential statistics is the: A) process of using a population parameter to estimate the values for sample statistics B) process of using sample statistics to estimate population parameters C) process which allows the researcher to determine the exact values for population parameters D) process that eliminates the problem of sampling error Statistical Inference 104 / 120 104) Which one of the following statement is true? A) The CUSUM and exponentially weighted moving average control chart has the same efficiency of detecting smaller (< 1.5δ) shift of quality character. B) If the defective item of product may cause danger to life and stop the whole function of the system, the quality agent has to use acceptance sampling. C) In EWMA, the weight parameter λ smaller implies, we have to give larger weight to the recent data and less weight for older data sets. D) B and C Statistical Quality Control 105 / 120 105) One of the following is correct about lot formation from the perspective of quality control A) The lot should be homogenous B) Lot should be conformable to material handling system C) The lot should be heterogenous D) A and B Statistical Quality Control 106 / 120 106) Which one of the following is true about control charts used to detect whether the process is in control or out control? A) P and C charts are used to detect variable quality character as in or out control B) X-bar and R control monitor the quality character, when it is attribute quality character. C) Narrowing the control limit will increase the risk of type I error. D) B and C Statistical Quality Control 107 / 120 107) A supper market owner want to buy Sky Soap from the manufacturer with lot size 100 items with fraction of incoming defective for the entire lots is 10 % and the number of acceptance is 2. Using single sampling plan, the supermarket owner randomly selects 10 packed soaps for inspection and observes the number of defective. The number of non-conforming/defective/ is distributed as binomial distribution. The probability of acceptance (Pa) and average total inspections (ATI) is _____ and _____, respectively. A) 0.9297 and 17 B) 0.900 and 23 C) 0.900 and 35 D) None Statistical Quality Control 108 / 120 108) In quality control, acceptance sampling is most likely to be not useful when: A) The cost of 100% inspection is extremely low B) 100% inspection is not technologically feasible C) The inspection error rate is sufficiently high D) All Statistical Quality Control 109 / 120 109) The basic role of statistical quality control in the product producing and service delivering modern business organization is____________ A) To avoid natural cause of variability in the product and service B) To avoid random cause of variability in the product and service C) To avoid Chaotic cause of variability in the product and service D) All Statistical Quality Control 110 / 120 110) ___ is a cause variation in the quality characteristics of a product and distributed as non-normal or non- random manner. A) Allowable cause of variation B) Assignable cause of variation C) Preventable cause of variation D) B and C Statistical Quality Control 111 / 120 111) In survey study, interviewer are liable to have mistaken and some of the ways the supervisor checks the quality of interviewing be: A) Observation of interview at work B) Review of completed questionnaire C) Double Entry D) A and B Research method and Sample Survey 112 / 120 112) One of the following is the main purpose of pilot survey: A) Check the organization and arrangement of the survey actually work satisfactorily. B) It checks the administrative and organizational arrangements of the supply and distribution of the response and equipment. C) It is used to identify weaknesses and problems with the survey D) All Research method and Sample Survey 113 / 120 113) _____ a questionnaire in where a pre-determined list of alternate responses is presented to the respondent for checking the appropriate one and the answers are restricting to limited ranges of response A) Closed ended questions B) Open ended Question C) Unstructured questions D) A and B Research method and Sample Survey 114 / 120 114) _ is a sampling method used when population is divided in to non-overlapping but exhaustive groups and elements in the same group should be more or less heterogeneous while homogeneous in different group. A) Simple random sampling B) cluster random sampling C) Stratified random sampling D) Judgment Sampling Research method and Sample Survey 115 / 120 115) Direction: Read the following two paragraphs carefully and answer the questions: The Ministry of Education aimed to study academic performance trends and job opportunities of graduated students from 1999 to 2013 E.C across Ethiopian universities graduated students. In the first stage, the study randomly selected 15 (10 from government and 5 from private) universities out of 80 (45 government and 35 private) universities. In the second stage, it randomly selected 10 departments from each university. Lastly, 300 former graduated students from each department were included in the survey and the data was collected from the samples. The study finding report was written using more detailed and complex statistical techniques for other researchers or project managers who are interested in the technical details of research design, sampling design, statistical method, and tables. Based on the above Paragraph under direction, what type of survey design and report did the Ministry of Education use to study the academic performance and job opportunities of graduated students? A) Multistage and popular report B) Single stage and Technical report C) Multistage and technical report D) None Research method and Sample Survey 116 / 120 116) Mr. A is a Guinness statistics professor; do you like to be his student and advisee?” In the above question, which type of question writing (phrasing) problem, do we find? A) Leading question B) Multiple question C) Sensetive question D) A and B Research method and Sample Survey 117 / 120 117) ____ is type of longitudinal survey study in which it surveyed the same subjects (people, group or organization) at different times over an extended period. A) Trend study B) Panel study C) Cohort study D) All Research method and Sample Survey 118 / 120 118) _____is a questionnaire in which a pre-determined list of alternate responses is presented to the respondent for checking the appropriate one and the answers are restricting to limited ranges of response. A) Open ended questions B) Closed Ended question C) Unstructured questions D) None Research method and Sample Survey 119 / 120 119) In sample size determination for a single stage sampling, which on is one of the following is needed? A) Confidence level B) Level variabilityin the variable C) level of precision for the estimate D) All Research method and Sample Survey 120 / 120 120) An inquiry on small number of study unit in which greater detail investigation can be done without considering randomness of unit is called ______. A) Census survey B) Case study C) Experimentations D) Sample survey Research method and Sample Survey Your score is 0%