Citibank Visa gives its cardholders “bonus dollars,” which may be spent in partial payment for gifts purchased with the Visa card. The company wants to estimate the average amount of bonus dollars that will be spent by a cardholder enrolled in the program during a year. A trial run of the program with a random sample of 225 cardholders is carried out. The results are Give a 95% confidence interval for the average amount of bonus dollars that will be spent by a cardholder during the year.

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