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

Multiple Choice

In constructing a 95% interval estimate for the ratio of two population variances, $\sigma _ { 1 } ^ { 2 }$ / $\sigma _ { 2 } ^ { 2 }$ , two independent samples of sizes 30 and 40 are drawn from the populations. If the sample variances are 425 and 675, then the upper confidence limit is about:

A) 1.2215.
B) 0.3132.
C) 1.2656.
D) 0.3246.