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A market specialist wants to estimate the average amount spent by visitors to an online retailer's site. from data in a preliminary study she estimates

A market specialist wants to estimate the average amount spent by visitors to an online retailer's site. from data in a preliminary study she estimates the standards deviation of the amount spent is about 14 dollars.

How large a sample should she take to estimate the mean amount spent within 4 dollars with 98% confidence? (rounf your answer up to the next largest integer).

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