An experiment has five treatment levels, and sixobservations per treatment group. (a) For a single planned contrast, what is the p value if t = 2.05? (b) For a contrast that is part of a family of...

An experiment has five treatment levels, and sixobservations per treatment group.

(a) For a single planned contrast, what is the p value if t = 2.05?

(b) For a contrast that is part of a family of four contrasts, with no structure, what is the p value if t = 2.05?

(c) For a contrast that was decided after examining the sample means, what is the p value if t = 2.05?

(d) If the researchers had planned to make all pairwise comparisons controlling the family-wise significance level at 5%, what is the p value if t = 2.05? (You will need statistical software for this part of the exercise.)