Why Do You Do Overall Tests When Comparing Multiple Means

Multiple Choice

Why do you do overall tests when comparing multiple means and not just do the follow-up confidence intervals?

A) Doing an overall test will more likely lead to significant results than just doing the follow-up confidence intervals.
B) Doing an overall test allows us to see exactly which group is significantly different from which other groups.
C) Doing an overall test allows us to quickly get our results, while the follow-up confidence intervals are very time-consuming.
D) Doing an overall test allows us to keep the probability of a type I error at 5% or whatever significance level we would like.