In an experiment where the means of 6 groups are being tested 2 at a time, ___ tests are conducted. If each test is analyzed using α = 0.01, the probability that at least 1 Type I error will be committed is ___.
A) 12; 0.12
B) 12; 0.88
C) 15; 0.14
D) 15; 0.86
E) 36; 0.30

Question

Quizplus · Accepted Answer

There are 15 pairwise comparisons (6 choose 2). The probability of at least one Type I error is 1 - (1 - 0.01)^15 ≈ 0.14.

In an Experiment Where the Means of 6 Groups Are