When Testing the Equality of Two Population Variances,the Test Statistic $$\sigma _ { 1 } ^ { 2 } / \sigma _ { 2 } ^ { 2 }$$

When testing the equality of two population variances,the test statistic is the ratio of the population variances;namely $$\sigma _ { 1 } ^ { 2 } / \sigma _ { 2 } ^ { 2 }$$
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