[5 10 15] Among 210 randomly selected credit card
Chapter 0, Problem SE6.7(choose chapter or problem)
[5 10 15] Among 210 randomly selected credit card customers, 142 incurred an interest charge in year 2008 because of an unpaid balance. a. Estimate the true proportion p of customers who incurred the interest charge in year 2008, along with the standard error of the estimator used. b. Construct a 95% confidence interval for p. c. How many customers must be selected to ensure that the width of the 95% confidence interval will be 0.06?
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