# 8.11: Chapter 10 Key Terms

- Page ID
- 51844

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- Cohen’s d
- a measure of effect size based on the differences between two means. If \(d\) is between 0 and 0.2 then the effect is small. If \(d\) approaches is 0.5, then the effect is medium, and if \(d\) approaches 0.8, then it is a large effect.

- Independent Groups
- two samples that are selected from two populations, and the values from one population are not related in any way to the values from the other population.

- Matched Pairs
- two samples that are dependent. Differences between a before and after scenario are tested by testing one population mean of differences.

- Pooled Variance
- a weighted average of two variances that can then be used when calculating standard error.