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To achieve high statistical power in psychological research, sample sizes must be larger than often realized. For an independent-samples $$t$$-test with a large population effect, it requires approximately $$26$$ participants per sample to reach a power of $$0.80$$, while reaching a power of $$0.99$$ requires $$59$$ participants per sample.

Example of Sample Size Requirements for High Statistical Power

Approximately how many participants per sample are required to reach a statistical power of 0.80 for an independent-samples t-test with a large population effect?

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