At the Seymour Clinic,the total number of patients seen by three doctors over three days is as follows: Which nonparametric test would you use to compare the median number of patients seen by the doctors on each day?
A) Wilcoxon test
B) Kruskal-Wallis test
C) Anderson-Darling test
D) Friedman test

Question

At the Seymour Clinic,the total number of patients seen by three doctors over three days is as follows:  Which nonparametric test would you use to compare the median number of patients seen by the doctors on each day?
A) Wilcoxon test 
B) Kruskal-Wallis test 
C) Anderson-Darling test 
D) Friedman test

Quizplus · Accepted Answer

The Friedman test is appropriate for comparing the medians of more than two related groups (in this case, the three days), where the data is ordinal and not normally distributed. The Wilcoxon test is appropriate for comparing the medians of two related groups, while the Kruskal-Wallis test is appropriate for comparing the medians of more than two independent groups. The Anderson-Darling test is a goodness-of-fit test for normality and cannot be used to compare medians.

At the Seymour Clinic,the Total Number of Patients Seen by Three