Solved: For each exercise, perform these steps. Assume that all variables are normally

Chapter 9, Problem 11

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For each exercise, perform these steps. Assume that all variables are normally or approximately normally distributed. a. State the hypotheses and identify the claim. b. Find the critical value(s). c. Compute the test value. d. Make the decision. e. Summarize the results. Use the traditional method of hypothesis testing unless otherwise specified.Noise Levels in Hospitals In the hospital study cited in Exercise 19 in Exercise set 81, the standard deviation of the noise levels of the 11 intensive care units was 4.1 dBA, and the standard deviation of the noise levels of 24 nonmedical care areas, such as kitchens and machine rooms, was 13.2 dBA. At a 0.10, is there a significant difference between the standard deviations of these two areas?