Mathematics, 09.06.2021 19:10 TrueKing184

John is the manager of a used clothing store. He wants to estimate the average amount a customer spends per visit. A random sample of 70 customers’ receipts gave a mean X  $7.10 with a standard deviation s = $2.30. Find a 90% confidence interval for the average amount spent by all customers.

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John is the manager of a used clothing store. He wants to estimate the average amount a customer spe...