In a manufacturing facility producing fasteners,a supervisor suspects that the diameter of the bolt produced by the second shift workers is greater than the diameter of the bolts produced by the first shift workers.The supervisor takes a sample of 5 bolts from the first shift and a sample of 4 bolts from the second shift and measures the diameters.The distribution of bolt diameter measurements is not normally distributed.Which one of the following nonparametric tests is appropriate for this problem?
A)Wilcoxon signed rank test
B)Wilcoxon rank sum test
C)Sign test
D)Kruskall-Wallis test
E)Spearman's rank correlation test

Question

Quizplus · Accepted Answer

The Wilcoxon rank sum test is appropriate for comparing two independent samples when the data are not normally distributed. The Wilcoxon signed rank test is appropriate for comparing two related samples, the sign test is appropriate for comparing two independent samples with dichotomous outcomes, the Kruskal-Wallis test is appropriate for comparing three or more independent samples, and Spearman's rank correlation test is appropriate for examining the relationship between two variables.

In a Manufacturing Facility Producing Fasteners,a Supervisor Suspects That the Diameter