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

A. Sample are dependent
B. The assumption of normality is not met
C. Sample sizes are small
D. Data are paired

322. The sign test assumes that the_______________?

A. Samples are independent
B. Samples have same mean
C. Sample are dependent
D. The Wilcoxon Signed Rank test is used

323Three 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_____________?

A. One-way analysis of variance (ANOVA)
B. Spearman Rank difference
C. Wilcoxon Rank-Sum test
D. Kruskal-Wallis test

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

A. Divided into at least two classifications
B. Divided into exactly two classifications
C. Quantitative
D. Qualitative

325. The Spearman Rank-Correlation test requires that the______________?

A. Data must be measured on the same scale
B. Data should be of ordinal scale at least
C. Data must be distribution at least approximately as a t-distribution
D. Data must be from two independent samples

326. Consistency of an estimator can be checked by comparing____________?

A. Standard Deviation
B. Mean
C. mean Square Error
D. Variance

327. 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_____________?

A. Herbicide A is more effective than Herbicide B
B. Herbicide A is not more effective than Herbicide B
C. Herbicide B is more effective than Herbicide A
D. Herbicide B is not more effective than Herbicide A

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

The sample are drawn from a normally distributed population.

A. The sample are drawn from a normally distributed population.
B. The variance of the population is known
C. All above
D. s (sample standard deviation) is an unbiased estimate of the population variance.

329. The t distribution are_____________?

A. Symmetrical
B. None of these
C. Same as Normal Curve
D. Skewed

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

A. Greater the degree of freedom, the more the t-distribution resembles the standard normal distribution
B. The Normal Curve is symmetrical whereas the t-distribution are slightly skewed.
C. The proportion of area beyond a specific value of “t” is less than the proportion of normal curve
D. Non of these

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