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

True/False

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