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

Chapter 9, Problem 7

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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.High and Low Temperatures March is a month of variable weather in the Northeast. The chart below records the actual high and low temperatures for a selection of days in March from the weather report for Pittsburgh, Pennsylvania. At the 0.01 level of significance, is there sufficient evidence to conclude that there is more than a 10 difference between average highs and lows? Maximum 44 46 46 36 34 36 57 62 73 53 Minimum 27 34 24 19 19 26 33 57 46 26