Test Hypotheses about a Population Mean with Known Using Confidence Intervals
-A group of 40 homeowners showed that their average monthly gasoline bill was $\$ 192$ with a standard deviation of $\$ 8$. According to a national consumer group, their mean bill should be $\mu = \$ 188$. Test this hypothesis by constructing a $95 \%$ confidence interval for the population mean.

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The Answer of Test Hypotheses about a Population Mean with Known Using Confidence Intervals
-A group of 40 homeowners showed that their average monthly gasoline bill was $\$ 192$ with a standard deviation of $\$ 8$. According to a national consumer group, their mean bill should be $\mu = \$ 188$. Test this hypothesis by constructing a $95 \%$ confidence interval for the population mean.

Test Hypotheses About a Population Mean with Known Using Confidence $192\$ 192$192

Test Hypotheses About a Population Mean with Known Using Confidence $\$ 192$