When to use pooled variance t test?
Understand the Problem
The question is asking about the conditions or situations under which a pooled variance t-test should be applied. The pooled variance t-test is typically used when comparing the means of two groups that have similar variances, particularly when the sample sizes are equal or similar for both groups.
Answer
Use it when the population variances are equal.
Use the pooled variance t-test when you assume or have reason to believe that the variances of the two populations being compared are equal.
Answer for screen readers
Use the pooled variance t-test when you assume or have reason to believe that the variances of the two populations being compared are equal.
More Information
Using the pooled variance t-test helps achieve a more accurate estimate of the common variance when the assumption of equal variances holds.
Tips
A common mistake is to use the pooled variance t-test without verifying if the variances are equal. This can lead to incorrect conclusions.
Sources
- Pooled Two-sampled t-test (Assuming Equal Variances) - stats.libretexts.org
- Pooled Variance - blogs.sas.com
- When to use pooled vs unpooled variance in Student's T-Test for ... - reddit.com
