Answer to Question #222441 in Statistics and Probability for qqq

Question

A marketing research analyst collects data for a random sample of 100 customers out of

the 400 who purchased a particular “coupon special”. The 100 people spent an average of x = $24.57 in the store with a standard deviation of $6.60. Using a 95% confidence

interval, estimate the mean purchase amount for all 400 customers.