Question

According to a study done by the Online Bookselling Center, the average delivery time for books purchased online and shipped via USPS first class mail is 3.65 days (onlinebookselling.net). Based on your experience, you believe the average delivery time is longer. You contact a random sample of 45 recent online book buyers who used first class mail for delivery and find that the average delivery time for the sample is 4.03 days. Compute the p value for the sample result and use it to test the null hypothesis that average delivery time for the population of books purchased online and shipped via first class mail is no more than 3.65 days. Use a 5% significance level for the test and assume that the population standard deviation is .92 days. Explain your conclusion.


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  • CreatedJuly 16, 2015
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