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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

When conducting an independent-samples t-test and expecting a large population effect, approximately how many participants per sample are required to achieve a statistical power of 0.80?

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