A pizza shop claims its average home delivery time is 20 minutes. A sample of 40 deliveries had a sample average of 22.9

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A Pizza Shop Claims Its Average Home Delivery Time Is 20 Minutes A Sample Of 40 Deliveries Had A Sample Average Of 22 9 1 (63.13 KiB) Viewed 22 times

A pizza shop claims its average home delivery time is 20 minutes. A sample of 40 deliveries had a sample average of 22.9 minutes. Assume the population standard deviation for the shop's deliveries is 7.4 minutes. Complete parts a and b below. a. Is there support for the shop's claim using the criteria that the sample average of 22.9 minutes falls within the symmetrical interval that includes 95% of the sample means if the true population mean is 20 minutes? Select the correct choice below and fill in the answer box within your choice. (Type an integer or decimal rounded to four decimal places as needed.) O A. The probability P(x222.9) = . This indicates that the sample average of 22.9 minutes is less than 5%, contradicting the shop's claim. B. The probability P(x2229) = This indicates that the sample average of 22.9 minutes is greater than 5%, supporting the shop's claim