Consider the following to answer the question(s) below:
A paint manufacturer is interested in determining whether there is a difference in time it takes for two different brands of paint to dry once they have been applied to a wall surface. To test this, the company has selected a random sample of 5 walls and applied Brand 1, and another 5 walls and applied Brand 2. The following data reflect the actual drying time in hours:

-The appropriate nonparametric method to use for these data is the
A) Wilcoxon rank-sum test.
B) Kruskal-Wallis test.
C) Kendall's tau test.
D) Spearman's rho test.
E) Wilcoxon signed-rank test.

Question

Consider the following to answer the question(s) below:
A paint manufacturer is interested in determining whether there is a difference in time it takes for two different brands of paint to dry once they have been applied to a wall surface. To test this, the company has selected a random sample of 5 walls and applied Brand 1, and another 5 walls and applied Brand 2. The following data reflect the actual drying time in hours:
 
-The appropriate nonparametric method to use for these data is the
A) Wilcoxon rank-sum test. 
B) Kruskal-Wallis test. 
C) Kendall's tau test. 
D) Spearman's rho test. 
E) Wilcoxon signed-rank test.

Quizplus · Accepted Answer

Since the sample sizes are less than 20, we cannot assume normality and therefore need a nonparametric test. Also, we are comparing two independent groups. Hence, the appropriate nonparametric test to use in this situation is the Wilcoxon rank-sum test.

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