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.

$\begin{array} { l l l l l l }
\hline 143 & 157 & 165 & 154 & 143 & 163 \
\hline
\end{array}$

Construct a 99% confidence interval for the mean magnesium ion concentration.

Question

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.

$\begin{array} { l l l l l l } 
\hline 143 & 157 & 165 & 154 & 143 & 163 \
\hline
\end{array}$

Construct a 99% confidence interval for the mean magnesium ion concentration.

Quizplus · Accepted Answer

The correct confidence interval is calculated using the sample mean, standard deviation, and the t-distribution for a 99% confidence level with 5 degrees of freedom.

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Six Measurements Were Made of the Magnesium Ion Concentration (In $\begin{array} { l l l l l l } \hline 143 & 157 & 165 & 154 & 143 & 163 \\\hline\end{array}$