A copy machine service company provides maintenance and repair service for different types and brands of copiers. The manager of the repair department wants to know if the repair time for brand A is higher than the repair time for brand B. The manager randomly selects eight repair records associated with brand A and eight repair records associated with brand B. The distribution of repair times for both brand A and brand B is highly skewed. Which one of the following nonparametric tests is appropriate for this problem?
A) Wilcoxon signed ranks test
B) Wilcoxon rank sum test
C) sign test
D) Kruskal-Wallis test
E) Spearman's rank correlation test

Question

Quizplus · Accepted Answer

The rank sum test is used when comparing two independent populations with small sizes and not normally distributed.

A Copy Machine Service Company Provides Maintenance and Repair Service