When the population variances are unequal, we estimate each population variance with its sample variance. Hence, the unequal-variances test statistic of is approximately Student t -distributed with n ₁ + n ₂ - 2 degrees of freedom.

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The Answer of When the population variances are unequal, we estimate each population variance with its sample variance. Hence, the unequal-variances test statistic of is approximately Student t -distributed with n ₁ + n ₂ - 2 degrees of freedom.

When the Population Variances Are Unequal, We Estimate Each Population