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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