Web Definition: Power
The power of a statistical test is the probability that the test will reject a false null hypothesis, or in other words that it will not make a Type II error. The higher the power, the greater the chance of obtaining a statistically significant result when the null hypothesis is false. Statistical tests attempt to use data from samples to determine if differences or similarities exist in a population. For example, to test the null hypothesis that the mean scores of men & women on a test do not differ, samples of men & women will be drawn, the test administered to them & the mean score in each group compared with a statistical test. If the populations of men & women have different mean scores but the test of the sample data concludes that there is no such difference, a Type II error has been made. Statistical power depends on the significance criterion, the size of the difference or the strength of the similarity in the population & the sensitivity of the data.
Read More »Dictionary Entry: Same as Poor, the fish. Ability to act, regarded as latent or inherent - the faculty of doing or performing something - capacity for action or performance - capability of producing an effect, whether physical or moral: potency - might - as, a man of great power - the power of capillary attraction - money gives power.
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