I am performing an ANOVA If I fail to reject the null hypoth

I am performing an ANOVA. If I fail to reject the null hypothesis, is it ok to use the Tukey-Kramer Procedure for multiple comparisions, or is that only done when you reject the null hypothesis?

Solution

No, Tukey-Kramer procedure should only be used when you reject the null hypothesis. Because When the decision from the One-Way Analysis of Variance is to reject the null hypothesis, it means that at least one of the means isn\'t the same as the other means. What we need is a way to figure out where the differences lie, not just that there is a difference.