The F Test for the Ratio of Two Variances
The test statistic for the difference between the variances of two independent populations is based on the ratio of the two sample variances. The sampling distribution follows the F distribution (see the assumptions below).
The null hypothesis of equality of variances:
is tested against the alternative hypothesis that the two population variances are not equal:
To illustrate this test for the difference between two variances, return to the example previously discussed concerning luggage delivery ...
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