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What is statistical power? Why is it important? Can a test be under-powered? What are the problems with an under-powered test. Can a test be

What is statistical power? Why is it important? Can a test be under-powered? What are the problems with an under-powered test. Can a test be over-powered? What indicates that a test is over-powered? As what stage in the testing process should statistical power be calculated? What can go wrong estimating statistical power?

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