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Mathematics 8 Online
OpenStudy (anonymous):

The local gym is interested in the percentage of people who exercise at least 60 minutes per week. 100 people are surveyed to see if they exercise at least 60 minutes per week. Surveyors found that 15% of people exercised this much. Using a 90% confidence level, computer a confidence interval estimate for the true proportion of people who exercise at least 60 minutes per week.

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