Comparing the output of strawberries grown on plots using fertilizer A with that grown on otherwise identical plots using fertilizer B, in order to make a general assessment of relative fertilizer effectiveness, may well call for a:
A) Friedman test
B) Kruskal-Wallis test
C) Wilcoxon rank-sum test
D) Spearman rank correlation test
E) chi-square test

Question

Quizplus · Accepted Answer

The Wilcoxon rank-sum test (also known as the Mann-Whitney U test) is appropriate for comparing the median values of two independent samples that are not normally distributed. In this scenario, we are comparing the yields of strawberries grown with two different fertilizers, and it is likely that the yields will not follow a normal distribution. Therefore, the Wilcoxon rank-sum test is the best choice to compare the effectiveness of the two fertilizers.

Comparing the Output of Strawberries Grown on Plots Using Fertilizer