Question

You run a one-way ANOVA on 9 groups. How many post-hoc between-group comparisons are necessary?

a) 41
b) 36
c) 21
d) 9

Answer 1

The number of post-hoc between-group comparisons necessary in a one-way ANOVA test with 9 groups is 36.

Step-by-step explanation:

In a one-way ANOVA test with 9 groups, the number of post-hoc between-group comparisons necessary can be calculated using the formula n(n-1)/2, where n is the number of groups. In this case, n = 9, so the number of comparisons is 9(9-1)/2 = 36.

Therefore, the correct answer is b) 36.