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A candidate running for sheriff in a rural community claims that she will reduce the average...

A candidate running for sheriff in a rural community claims that she will reduce the average speed of emergency response to less than 30 minutes (average response time last year). There are no past records so the standard deviation of past response times cannot be determined. Thanks to the campaign, she is elected sheriff, and careful records are now kept. The response times for the first month are 26, 30, 29, 25, 28, 32, 35, 24, and 23 minutes. a. Use all the steps of hypothesis testing. b. Using the .05 level of significance, did she keep her promise?

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