As a preliminary step in its product testing, a fast food chain has two small groups (4 teenagers, 6 older adults) sample the item and "grade" it on "taste." Ratings were grades A to C (including + and -).What nonparametric method is appropriate to determine if the two groups differ in opinion?
A)Wilcoxon Rank-Sum
B)Wilcoxon Signed-Rank
C)Spearman's rho
D)Kruskal Wallis
E)Kendall's tau

Question

Quizplus · Accepted Answer

The Wilcoxon Rank-Sum test is appropriate for comparing the distributions of two independent samples, which is the case with the two small groups (teenagers and older adults) grading the taste of a product. This test does not assume normal distribution and is suitable for ordinal data, such as grades A to C.

As a Preliminary Step in Its Product Testing, a Fast