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You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have...

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Statistics

You are the manager of a restaurant that delivers pizza tocollege dormitory rooms. You have just changed your deliveryprocess in an effort to reduce the mean time between the order andcompletion of delivery from the current 25 minutes. A sample of 36orders using the new delivery process yields a sample mean of 22.4minutes and a sample standard deviation of 6 minutes.

A) Using the six-step critical value approach, at the 0.05 level ofsignificance, is there evidence that the population mean deliverytime has been reduced below the previous population mean value of25 minutes?
B) At the 0.05 level of significance, use the five-step P-valueapproach.
C) Interpret the meaning of the P-value in (b).
D) Compare your conclusions in (a) and (b).

Answer & Explanation Solved by verified expert
4.4 Ratings (1158 Votes)
a Critical value ApproachThe hypothesis areRejection regionReject Ho if Z Z 005 165Critical value at95 for left tailed test is 165Test ststisticConclusionSince the Z score    See Answer
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