Six Measurements Were Made of the Magnesium Ion Concentration (In $\begin{array}{llllll}\hline 189 & 175 & 140 & 188 & 179 & 211 \\\hline\end{array}$

Multiple Choice

Six measurements were made of the magnesium ion concentration (in parts per million, o in a city's municipal water supply, with the following results. It is reasonable to assume th population is approximately normal.
$\begin{array}{llllll}\hline 189 & 175 & 140 & 188 & 179 & 211 \\\hline\end{array}$

Construct a $98 \%$ confidence interval for the mean magnesium ion concentration.

A) $176.4 < \mu < 184.3$
B) $148.3 < \mu < 212.4$
C) $145.2 < \mu < 215.5$
D) $176.7 < \mu < 184.0$ )