Recently, Seasons Pizza has begun receiving complaints from customers about the amount of time they wait for their pizza deliveries. To address this issue, Seasons made some operational changes and added more delivery people to its staff. The restaurant would now like to test the hypothesis that the average delivery time is less than 30 minutes. The following data represent a random sample of delivery times:
23 24 23 36 30 40 34 24 28 29 15 27
Using σ = 0.10, answer the following:
a. State the null and alternative hypotheses.
b. Does this sample provide enough evidence to support Season’s delivery claim?
c. Estimate the p value for this test using Table 5 in Appendix A.
d. Determine the precise p value for this test using Excel.
e. Use PHStat to validate these results.
f. What motivation might Season’s Pizza have with choosing σ = 0.10?
g. What assumptions need to be made to perform this analysis?

  • CreatedJuly 17, 2015
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