For Exercises 7 through 20, perform the following steps. Assume that all variables are
Chapter 9, Problem 10(choose chapter or problem)
For Exercises 7 through 20, perform the following steps. Assume that all variables are normally distributed. a. State the hypotheses and identify the claim. b. Find the critical value. 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 71, it was found that the standard deviation of the sound levels from 20 areas designated as casualty doors was 4.1 dBA and the standard deviation of 24 areas designated as operating theaters was 7.5 dBA. At a 0.05, can you substantiate the claim that there is a difference in the standard deviations?
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