# When should we use pooled, non-pooled or paired output to compare the means of two populations. you need to be specific and give the correct answer.

When should we use pooled, non-pooled or paired output to compare the means of two populations. you need to be specific and give the correct answer.
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Nichole Watt
We use the pooled test when there is a homogeneity of variance among the groups. We use the non-pooled test when there is no homogeneity of variance among the groups. We perform the F-test to check if there is a homogeneity of variance among the groups. As a standard rule, the ratio of the largest to smallest standard deviation should be less than 2 in order to meet the homogeneity of variance assumption among the groups.
We use the paired inference when each subject is tested twice and the pooled or the non-pooled test is used when the subjects are independent of each other.