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Mathematics, 28.11.2019 22:31 Ezekielcassese
Amarketing specialist wants to estimate the average amount spent by visitors to an online retailer's newly-designed website. from the data in a preliminary study she guesses that the standard deviation of the amount spent is about 12 dollars.
how large a sample should she take to estimate the mean amount spent to within 4 dollars with 98% confidence? (round your answer up to the next largest integer).
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