Annual fee induce customers to charge more on credit cards

Reference no: EM13105312

A bank wonders whether omitting the annual credit card fee for customers who charge at least $2400 in a year will increase the amount charged on its credit cards. The bank makes this offer to an SRS of 200 of its credit card customers. It then compares how much these customers charge this year with the amount that they charged last year. The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?

Reference no: EM13105312

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