Statistics MCQs

Page No. 36

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


aDivided into at least two classifications

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b Divided into exactly two classifications

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cQuantitative

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dQualitative

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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)

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b Spearman Rank difference

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cWilcoxon Rank-Sum test

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dKruskal-Wallis test

✓


View Answer Kruskal-Wallis test

The sign test assumes that the_______________?


aSamples are independent

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bSamples have same mean

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cSample are dependent

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dThe Wilcoxon Signed Rank test is used

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View Answer Sample are dependent

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


aSample are dependent

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bThe assumption of normality is not met

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cSample sizes are small

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dData are paired

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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

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

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

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dNon of these

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The t distribution are_____________?


aSymmetrical

✓


b None of these

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cSame as Normal Curve

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dSkewed

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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.

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bThe variance of the population is known

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cAll above

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

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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

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bHerbicide A is not more effective than Herbicide B

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cHerbicide B is more effective than Herbicide A

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dHerbicide B is not more effective than Herbicide A

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Consistency of an estimator can be checked by comparing____________?


aStandard Deviation

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bMean

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cmean Square Error

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dVariance

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View Answer Variance

Criteria to check a point estimator to be good are_____________?


aConsistency

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b All Above

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cUnbiasedness

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dEfficiency

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View Answer All Above

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