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Adequate Statistical Power
In psychological research, it is generally recommended that a study's design possess adequate power prior to data collection. A widely accepted guideline is that an adequate level of statistical power is . This indicates that if the expected effect or relationship truly exists in the population, the study has an chance of successfully detecting it and rejecting the null hypothesis.
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Research Methods in Psychology - 4th American Edition @ KPU
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Which of the following best defines the statistical power of a research design?
A researcher designs a study with a statistical power of .80. This means there is a 20% probability that the study will fail to detect a real effect that actually exists in the population.