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Example of Sample Size Requirements for High Statistical Power

To achieve high statistical power in psychological research, sample sizes must be larger than often realized. For an independent-samples tt-test with a large population effect, it requires approximately 2626 participants per sample to reach a power of 0.800.80, while reaching a power of 0.990.99 requires 5959 participants per sample.

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Updated 2026-05-04

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Research Methods in Psychology - 4th American Edition @ KPU