11.22 An independent random sampling design was used to compare the means of six treatments based on samples of four observations per treatment. The pooled estimator of o is 9.12, and the sample means follow: = 101.6 2 98.4 x = 112.3 x4 = 92.9x5=104.2 x6 = 113.8

a. Give the value of w that you would use to make pairwise comparisons of the treatment means for = 0.05.

b. Rank the treatment means using pairwise comparisons.