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A social worker wishes to estimate with 95% confidence the average daily amount of time spent by a mother with her infant such that the

A social worker wishes to estimate with 95% confidence the average daily amount of time spent by a mother with her infant such that the margin of error is 1 hr. In the past, it was determined that the standard deviation of the daily times spent by a mother with her infant is 2.5 hr. How many mothers should the social worker interview?

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