Test Hypotheses About a Population Mean with Known Using Confidence $\$ 150$

Short Answer

Test Hypotheses about a Population Mean with Known Using Confidence Intervals
-In a random sample of 60 digital cameras, the mean repair cost was $\$ 150$ with a standard deviation of $\$ 36$ . A local repairman claims that the mean cost of repair should be $\$ 165$ . Test this hypothesis by constructing a $99 \%$ confidence interval for the population mean.