# Confidence interval for ratio of 2 population variances

A manufacturer needs to compare the weights of a product produced at 2 different plants. A random sample of 16 items from Plant A has a standard deviation of 12 milligrams and a random sample of 25 items from Plant B has a standard deviation of 15 milligrams. Assuming that both populations are normally distributed, construct a 99% confidence interval for the ratio of the 2 population variances.

© BrainMass Inc. brainmass.com June 3, 2020, 6:23 pm ad1c9bdddfhttps://brainmass.com/statistics/confidence-interval/confidence-interval-for-ratio-of-2-population-variances-58392

#### Solution Summary

This solution constructs a 99% confidence interval for the ratio of 2 population variances provided.

$2.19