In Constructing a 95% Interval Estimate for the Ratio of Two

In constructing a 95% interval estimate for the ratio of two population variances, $\sigma _ { 1 } ^ { 2 }$ / $\sigma _ { 2 } ^ { 2 }$ , two independent samples of sizes 41 and 61 are drawn from the populations. If the sample variances are 515 and 920, then the upper confidence limit is: $\begin{array}{|l|l|}\hline\text { A. } & 0.321 . \\\hline \text { B. } & 1.009 . \\\hline \text { C. } & 0.311 . \\\hline \text { D. } & 0.974 . \\\hline\end{array}$