In multiple comparison procedures, post-hoc tests are completed after the ANOVA. Why are post-hoc tests preferred over running several t-tests?
A) They decrease the probability of a Type I error.
B) They do not control familywise error rate.
C) It increases the probability of a Type I error.
D) They are more likely to be significant.

Question

Quizplus · Accepted Answer

Post-hoc tests adjust for multiple comparisons, decreasing the probability of Type I errors. Running several t-tests without appropriate adjustments increases the overall probability of a Type I error.

In Multiple Comparison Procedures, Post-Hoc Tests Are Completed After the ANOVA