When comparing two population variances, we use the difference $\sigma _ { 1 } ^ { 2 } - \sigma _ { 2 } ^ { 2 }$ rather than the ratio $\sigma _ { 1 } ^ { 2 } / \sigma _ { 2 } ^ { 2 }$ .

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When comparing two population variances, we typically use the ratio $\sigma _ { 1 } ^ { 2 } / \sigma _ { 2 } ^ { 2 }$, often through an F-test, to determine if the variances are significantly different.

When Comparing Two Population Variances, We Use the Difference σ12−σ22\sigma _ { 1 } ^ { 2 } - \sigma _ { 2 } ^ { 2 }σ12​−σ22​

When Comparing Two Population Variances, We Use the Difference $\sigma _ { 1 } ^ { 2 } - \sigma _ { 2 } ^ { 2 }$