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A Random Sample of 10 Waitresses in Darwin Revealed the Following

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A random sample of 10 waitresses in Darwin revealed the following hourly earnings (in dollars, including tips): 19181516181716182014\begin{array}{|r|r|r|r|r|r|r|r|r|r|}\hline19&18&15&16&18&17&16&18&20&14\\\hline\end{array} If the hourly earnings are normally distributed with a standard deviation of $4.5, estimate with 95% confidence the mean hourly earnings for all waitresses in Darwin.


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