statistics MCQs – Page 45

Practise multiple-choice questions from statistics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

881. x=40 is estimator of _________________?
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A. 6

B. Ux

C. 6/?n

D. (U)
882. Three brands of coffee are rated for tasted on a scale of 1 to 10. Six persons are asked to rate each brand so that there is a total of 18 observations.The appropriate test to tasted equally good is_____________?
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A. Kruskal-Wallis test

B. Wilcoxon Rank-Sum test

C. Spearman Rank difference

D. One way analysis of variance (ANOVA)

883. A_______ is the specific value of the statistic used to estimate the population parameter?
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A. None of these

B. Point estimator

C. Estimator

D. C.I.

884. E(x1 x2)= ___________________?
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A. 6x x2

B. 62 x2

C. ux x2

D. u1 u2
885. If n = 400 and P=.69 then 90% C.I for P is _________________?
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A. .798 and .745

B. .314 and .652

C. None of these

D. 652 and . 728
886. When testing for randomness, we can use_____________?
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A. None of these

B. Runs test

C. D Mann-Whitney U test

D. Sign test

887. for two estimators T1=t1(X1,X2,.Xn) and T1=t1(X1,X2,.Xn) then estimators t1 is defined to be Rt1(?)?Rt2(?) for all ? in ? ?
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A. Admissible estimator

B. Sufficient estimator

C. Minimax estimator

D. Consistent estimator

888. Which of the following test must be two-sided ?
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A. Runs test

B. Sign test

C. Kruskal-Wallis

D. Wilcoxon Signed Rank

889. The minimum variance unbiased estimator of the population mean is _______________?
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A. S/?n

B. 6x/?n

C. S2/n

D. 6/?n

890. To perform a Runs test for randomness the data must be_______________?
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A. Divided into at least two classifications

B. Divided into exactly two classifications

C. Qualitative

D. Quantitative

891. For t distribution, increasing the sample size, the affect will be on ?
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A. Standard Error of the Means

B. Degrees of Freedom

C. The t-ratio

D. All Above
892. An estimator Q is an unbiased estimator of the population parameter Q if ___________________?
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A. E(Q) =Q

B. E(x) =

C. E(Q) =Q

D. E(P) = P

893. Comparing the times to failure of radar transponders made by firms A, B, and C based on an airlines sample experience with the three types of instruments one may use____________?
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A. Kruskal-Wallis test

B. Spearman Rank Correlation test

C. Wilcoxon Rank-Sum test

D. Kolmogorov-Smirnor test

894. The Spearman Rank-Correlation test requires that the______________?
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A. Data must be from two independent samples

B. Data must be measured on the same scale

C. Data should be of ordinal scale at least

D. Data must be distribution at least approximately as a t-distribution

895. The sign test assumes that the_______________?
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A. The Wilcoxon Signed Rank test is used

B. Sample are dependent

C. Samples are independent

D. Samples have same mean

896. Power of test is denoted by _______________?
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A. ?

B. (1 ?)

C. (1 ? )

D. ?

897. Analysis of Variance (ANOVA) is a test for equally of______________?
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A. Proportions

B. Only two parameters

C. Means

D. Variances
898. If Ho is stated as Q = Qo< the alternate hypothesis in general stated________________?
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A. Q ? Qo

B. None of these

C. Q Qo

899. ___________ is a value of sample statistics?
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A. Probability

B. Numerical

C. Estimator

D. Estimate
900. The level of significance is denoted by _________________?
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A. 1 ?

B. ?

C. ?

D. 1 ?