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?

Answer rating: 100% (QA)

The social worker will need to interview at least 384 mothers in order to have a margin of error o... View the full answer