The test statistic used for a test of two equal variances is known as the F statistic. You would compute this statistic essentially by taking the ratio of the variances of two samples.
Since we are to assume s₁² is the larger sample variance. We will express the F statistic as a ratio of sample variances as follows: f = s₁² / s₂².
Given this, we can match this with its appropriate form in the options provided above. Thus, the correct option is option c: f = s₁² / s₂². This is the statistic we use to test the hypothesis that the variances of two populations are equal.
Hence, the correct answer is "c".