Question: Revisiting the dust exposure study. The twosample problem in Exercise 7.65 (page 468) compares drill and blast workers with outdoor concrete workers with respect to

Revisiting the dust exposure study. The twosample problem in Exercise 7.65 (page 468)

compares drill and blast workers with outdoor concrete workers with respect to the total dust that they are exposed to in the workplace. Here it may be useful to know whether or not the standard deviations differ in the two groups. Perform the F test and summarize the results. Are you concerned about the assumptions here? Explain why or why not.

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