A Study Reports Data on the Rate of Oxygenation in Streams

question 7

Essay

A study reports data on the rate of oxygenation in streams at $20 ^ { \circ }$ C in certain region. The sample mean and standard deviation were computed as $\bar { x } = .173 \text { and } s = .066 \text {, }$ respectively. Based on the accompanying frequency distribution, can it be concluded that oxygenation rate is a normally distributed variable? Use the chi-squared test with $\alpha = .05$ $$\begin{array} { c c } \hline \text { Rate (per day) } & \text { Frequency } \\\hline \text { Below .100 } & 14 \\\hline .100 \text {-below } & 24 \\.150 & \\\hline .150 \text { - below } & 28 \\.200 & \\\hline .200 \text {-below } & 18 \\.250 & \\\hline .250 \text { or more } & 16 \\\hline\end{array}$$

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