Before launching its Buyers Assurance Program American Express wanted to
Before launching its Buyers' Assurance Program, American Express wanted to estimate the proportion of cardholders who would be interested in this automatic insurance coverage plan. A random sample of 250 American Express cardholders was selected and sent questionnaires. The results were that 121 people in the sample expressed interest in the plan. Give a 99% confidence interval for the proportion of all interested American Express cardholders.
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