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What is power analysis?
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It is the analysis to determine the appropriate sample size such that the probability of making a type 1 or type 2 error in rejecting or failing to reject a null hypothesis will be acceptable for a given set of circumstances.

In other words, it aims to estimate the number of observations/sample size you need to have a good chance of detecting the effect that you are seeking. Power analysis informs us on whether an experiment is worth doing or not.
by Diamond (39,212 points)

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