EngrProbStat Ch6V7

This video explains how to set the null hypothesis to test if the variance of a normal population equal, larger, or smaller than specified value. The test statistics for the variance has a chi-square distribution. A brief review of the chi-square distribution is given in this video. The second part of the video explains how to set the null hypothesis to test if the variance of population A is equal, larger, or smaller than the variance of population B. The test statistics for the ratio of the two variances has F distribution. A quick review of the F distribution is given in this video. Practical examples are solved to demonstrate the concepts and the steps for the tests.