Statistics MCQs

Page No. 36

To perform a Runs test for randomness the data must be_______________?


aDivided into at least two classifications


b Divided into exactly two classifications


cQuantitative


dQualitative



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_____________?


aOne way analysis of variance (ANOVA)


b Spearman Rank difference


cWilcoxon Rank-Sum test


dKruskal-Wallis test


View Answer Kruskal-Wallis test

The sign test assumes that the_______________?


aSamples are independent


bSamples have same mean


cSample are dependent


dThe Wilcoxon Signed Rank test is used


View Answer Sample are dependent

The Mann-Whitney U test is preferred to a t-test when____________?


aSample are dependent


bThe assumption of normality is not met


cSample sizes are small


dData are paired



Which of the following is a true statement for comparing the t distribution with standard normal ?


aGreater the degree of freedom, the more the t-distribution resembles the standard normal distribution


bThe Normal Curve is symmetrical whereas the t-distribution are slightly skewed.


cThe proportion of area beyond a specific value of “t” is less than the proportion of normal curve


dNon of these



The t distribution are_____________?


aSymmetrical


b None of these


cSame as Normal Curve


dSkewed


View Answer Symmetrical

Which of the following is an assumption underlying the use of the t-distribution ?


aThe sample are drawn from a normally distributed population.


bThe variance of the population is known


cAll above


ds (sample standard deviation) is an unbiased estimate of the population variance.



Herbicide A has been used for years in order to kill a particular type of weed. An experiment is to be conducted in order to see whether a new herbicide, Herbicide B, is more effective than Herbicide A. Herbicide A will continue to be used unless there is sufficient evidence that Herbicide B is more effective. The alternative hypothesis in this problem is_____________?


aHerbicide A is more effective than Herbicide B


bHerbicide A is not more effective than Herbicide B


cHerbicide B is more effective than Herbicide A


dHerbicide B is not more effective than Herbicide A



Consistency of an estimator can be checked by comparing____________?


aStandard Deviation


bMean


cmean Square Error


dVariance


View Answer Variance

Criteria to check a point estimator to be good are_____________?


aConsistency


b All Above


cUnbiasedness


dEfficiency


View Answer All Above

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