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Suppose we find the Error to be too high on the UNT football game attendees ( mean=53miles , st dev= 16 miles) and wish it

Suppose we find the Error to be too high on the UNT football game attendees ( mean=53miles , st dev= 16 miles) and wish it to be no more than 2.5 miles. Keeping the 95% confidence level, what is the minimum sample size we should take to keep the error at 2.5 miles

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