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You take a survey of 25 of your friends. 16 of them say they eat out at least 5 times a week. Estimate the proportion

You take a survey of 25 of your friends. 16 of them say they eat out at least 5 times a week. Estimate the proportion of people who eat out at least 5 times a week by constructing a 90% confidence interval.

Clearly state the Formulas and variables used.

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