A random sample of 10 waitresses in Darwin revealed the following hourly earnings (in dollars, including tips): $\begin{array}{|l|l|l|l|l|l|l|l|l|l|}
\hline19 & 18 & 15 & 16 & 18 & 17 & 16 & 18 & 20 & 14 \
\hline
\end{array}$ 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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The Answer of A random sample of 10 waitresses in Darwin revealed the following hourly earnings (in dollars, including tips): $\begin{array}{|l|l|l|l|l|l|l|l|l|l|}
\hline19 & 18 & 15 & 16 & 18 & 17 & 16 & 18 & 20 & 14 \
\hline
\end{array}$ 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.

A Random Sample of 10 Waitresses in Darwin Revealed the Following