Suppose you have observations from six different regions within your state and you wish to do hypothesis tests to compare the mean income across groups. How many comparisons can be done with six groups?
A)30
B)11
C)15
D)20

Question

Quizplus · Accepted Answer

The number of pairwise comparisons that can be made between six groups is given by the combination formula C(n, 2), where n is the number of groups. For six groups, this is C(6, 2) = 15.

Suppose You Have Observations from Six Different Regions Within Your