Question: Perfect Parachute Company conducted a study to determine if any significant difference exists in the strength of parachutes woven from fibers obtained from the different suppliers. Five parachutes were woven for each group, and the strength of the parachutes was measured by a tensile-strength device such that the larger the value the stronger the parachute.

a. Use a 0.05 level of significance to test the claim that the sample means for the four suppliers are the same. State and check all assumptions for the statistical test used.

b. If you reject H_o, then perform a test after ANOVA to determine which mean(s) are different.