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Confidence Intervals for Population Proportion
8. Sampling Distributions & Confidence Intervals: Proportion / Confidence Intervals for Population Proportion / Problem 1
Problem 1

A fitness center wants to estimate, with 90%90\% confidence, the proportion of its members who attend workout sessions at least three times a week. The estimate must be accurate within 3%3\% of the true population proportion. A previous survey showed that 83%83\% of members attend workout sessions this frequently. What is the minimum sample size needed?