NON-PARAMETRIC TESTS

Question 1

SIGN TEST

Answer 1

compares the medians of two related groups (like before-and-after measurements) when data is not normally distributed.

Question 2

WILCOXON SIGNED RANK TEST

Answer 2

similar to Sign Test, but considers magnitude of differences.

Question 3

MEDIAN TEST

Answer 3

best for comparing two independent groups when the data is nominal scale or when the distributions are not similar.

Question 4

KRUSKAL-WALLIS RANK TEST

Answer 4

best for comparing three or more independent groups when the data is ordinal or interval scale and the assumptions of ANOVA are not met.

Question 5

FRIEDMAN TEST

Answer 5

compares the medians of three or more related groups (like repeated measures) when data is not normally distributed.

Question 6

PERMUTATION TEST

Answer 6

uses resampling to assess the significance of a statistic, often for comparing groups or testing hypotheses.

Question 7

COCHRAN TEST

Answer 7

compares the variances of two or more related groups when data is not normally distributed.

Question 8

SQUARED RANK TEST FOR VARIANCES

Answer 8

compares the variances of two independent groups when data is not normally distributed.

Question 9

SPEARMAN’S RANK CORRELATION COEFFICIENT TEST

Answer 9

measures the strength and direction of the association between two ranked variables.