Borrowers Bank classifies credit cardholders as “prime” whenever they pay interest charges for at least 6 of the last 12 billing cycles. The table below cross classifies 2080 cardholders according to whether they are (i) prime or not, and (ii) below age 30 or not:              Below 30          30 and Over Prime        475                     510 Not Prime 376                      719 a. Construct a 95% confidence interval for the percentage of prime cardholders among those who are less than 30 years old

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