Question

Consider an experiment in which 45 zirconium disks were divided into five groups of 9 each. Then a different contamination/cleaning protocol was used for each group. Use Tukey's procedure on the data below to identify differences in true average bond strengths (MPa) among the five protocols. (Use α = 0.05.) Treatment: 1 2 3 4 5 Sample mean 10.5 14.8 15.7 16.0 21.6 Grand mean = 15.7 Sample sd 4.2 6.8 6.2 6.9 6 MSE = 37.186 Find the value of w. (Round your answer to two decimal places.) w = Which means differ significantly from one another? (Select all that apply.) x1. and x2. x1. and x3. x1. and x4. x1. and x5. x2. and x3. x2. and x4. x2. and x5. x3. and x4. x3. and x5. x4. and x5. There are no significant differences. You may need to use the appropriate table in the Appendix of Tables to answer this question.

Answer 1