Season’s Pizza recently hired additional drivers and as a result now claims that its average delivery time for orders is under 45 minutes. A sample of 30 customer deliveries was examined, and the average delivery time was found to be 42.3 minutes. Historically, the standard deviation for delivery time is 11.6 minutes. Using σ = 0.05, answer the following questions:
a. Does this sample provide enough evidence to refute the delivery time claim made by Season’s Pizza?
b. Determine the p value for this test.
c. Verify your results using PHStat.

  • CreatedJuly 17, 2015
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