Pooled Variance

What Is Variance in Statistics? Definition, Formula, and Example

Pooled Sample Standard Error: How to Calculate it

SOLVED: The previous problem demonstrates that removing individual differences can substantially reduce variance and lower the standard error. However, this benefit only occurs if the individual differences are consistent across treatment conditions. In problem 21, for example, the participants with the highest scores in the more-sleep condition also had the highest scores in the less-sleep condition. Similarly, participants with the lowest scores in the first condition also had the lowest score