Refer to Exercise 13 in Section 9.1.Ametallurgistwants to determine whether the mean tensile strength for specimens annealed at 900◦C differs from the mean strengths for specimens annealed at 750◦C, 800◦C, and 850◦C.
a. Use the Bonferroni method to determine which of the means, if any, for 750◦C, 800◦C, and 850◦C differ from the mean for 900◦C.
b. Use the Tukey-Kramer method to determine which of the means, if any, for 750◦C, 800◦C, and 850◦C differ from the mean for 900◦C.
c. Which is the more powerful method to find all the pairs of treatments whose means differ from the 900◦C mean, the Bonferroni method or the Tukey-Kramer method?