If there is equal variance in groups or homogeneity of variance then the variance would be ó₁² = ó₂² = ó^2.

Question

Quizplus · Accepted Answer

When there is equal variance in groups, the variance of the sample means (S1U1B1 and S1U1B0 in this case) and the variance of the individual scores (S1U1P1 and S1P0) are equal. Therefore, the formula for the variance of the sample means can be simplified to óS1U1P1^2/S1S1P0, which is the same as óS1U1B1^2/S1S1P0 and óS1U1B0^2/S1S1P0.

If There Is Equal Variance in Groups or Homogeneity of Variance