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A study was conducted to estimate the mean number of weekly hours that adults in the US use computers at home.
A random sample of 81 adults give a mean weekly computer usage time of 8.5 hours. From prior studies, the population standard deviation is assumed to be 3.6 hours.
What is the 95% confidence interval for the mean number of weekly hours that United States adult use computers at home? Show work.
1. if the population is normally distributed then the sample mean is also normally distributed even for small sample
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