One-Way ANOVA Is Applied to Independent Samples Taken from Three $n _ { 1 } =$

One-way ANOVA is applied to independent samples taken from three normally distributed populations with equal variances. The following summary statistics are calculated: $n _ { 1 } =$ 18, $\bar { x } _ { 1 } =$ 15, $s _ { 1 } =$ 2. $n _ { 2 } =$ 10, $\bar { x } _ { 2 } =$ 20, $s _ { 2 } =$ 3. $n _ { 3 } =$ 12, $\bar { x } _ { 3 } =$ 16, $s _ { 3 } =$ 1. The within-treatments variation equals: $\begin{array}{|l|l|}\hline\text { A. } & 82.95 . \\\hline \text { B. } & 160 . \\\hline \text { C. } & 19.2 . \\\hline \text { D. } & 165.9 \\\hline\end{array}$