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Six Measurements Were Made of the Magnesium Ion Concentration (In 175177175180138138\begin{array}{llllll}\hline 175 & 177 & 175 & 180 & 138 & 138 \\\hline\end{array}

Question 38
Multiple Choice
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Multiple Choice

Six measurements were made of the magnesium ion concentration (in parts per million, or ppm) in a city's municipal water supply, with the following results. It is reasonable to assume that the population is approximately normal
175177175180138138\begin{array}{llllll}\hline 175 & 177 & 175 & 180 & 138 & 138 \\\hline\end{array}
Construct a 90%90 \% confidence interval for the mean magnesium ion concentration.

A) (145.7,182.0)( 145.7,182.0 )
B) (147.3,180.4)( 147.3,180.4 )
C) (161.2,166.4)( 161.2,166.4 )
D) (161.0,166.7)( 161.0,166.7 )

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