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13. A 2007 Gallup poll randomly sampled 1019 people, and asked them how long it took...

13. A 2007 Gallup poll randomly sampled 1019 people, and asked them how long it took them to commute to work each day. The sample mean one-way commute time was 22.8 minutes with a standard deviation of 17.9 minutes. A transportation engineer claims that the mean commute time is greater than 20 minutes. Do the data provide convincing evidence that the engineer’s claim is true? Use the α = .05 level of significance. a. Check the conditions. b. State the hypotheses. c. Perform the test stating the test used, the p-value, and the decision. d. Write a conclusion in context using a complete sentence.

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