Question: Recent data from a national survey indicated that the average woman goes to a hair salon once every five weeks and spend on average $56

Recent data from a national survey indicated that the average woman goes to a hair salon once every five weeks and spend on average $56 40. A sample of 80 women yielded a sample standard deviation of $12. Use this data to construct a 99% confidence interval for the average amount spent at a hair salon by this sample.

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