Answer to Question #149749 in Statistics and Probability for Ann

Question

The manager of a restaurant that delivers pizza to college dormitory rooms has just changed the)delivery process in an effort to reduce the mean time between the order and the completion of the delivery from the current 30 minutes. A sample of 40 orders using the new delivery process yields a mean of 27.5 minutes and a standard deviation of 4 minutes. Using the steps of p- value approach (a) at 0.01 level of significance , is there an evidence that the population mean delivery time has been reduced below the previous population mean of 30 minutes? (b) what is your decision if the testing is done at 0.05? (c) Give your interpretation of your answer in (b).

Answer 1

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