The Kruskal-Wallis test statistic can be approximated by a chi-squared distribution with k - 1 degrees of freedom (where k is the number of populations) whenever the sample sizes are all greater than or equal to:
A) 5
B) 15
C) 25
D) 30
E) 45

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test requires at least 5 observations per group for the chi-squared approximation to be valid. Therefore, choice A (5) is the best answer.

The Kruskal-Wallis Test Statistic Can Be Approximated by a Chi-Squared