Question: Consumer Reports uses a 1 0 0 - point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with

Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfaction rating score, a population standard deviation of =12 is expected. Costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating for overall quality. A sample of 15 Costco customer satisfaction scores is contained in the Excel screenshot below. I need help with questions a. b. c.and d.
 Consumer Reports uses a 100-point customer satisfaction score to rate the

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