1a) Overtime Hours WorkedA random sample of12 registered nurses in a large hospital showed that they worked on average44.4 hours perweek.The standard deviation of the sample was2.8.Estimate the mean of the population with99% confidence.Assume the variable is normallydistributed.Round intermediate answers to at least three decimalplaces.Round your final answers to one decimalplace.

____ < < ____

1b) Social Networking SitesA recent survey of8 social networking sites has a mean of14.15 million visitors for a specificmonth.The standard deviation was3.2 million.Find the80% confidence interval of the truemean.Assume the variable normallydistributed.Round your answers to at least two decimalplaces.

____ million < < ____ million