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For a test for my stats class, we were asked, "When performing a statistical test on a sample, which of the following is NOT a random variable?"

A) The Test Statistic B) the p-value C) The power of the test D) The range of the variable in the sample E) the 95% confidence interval

I know that functions of random variables are also random variables, so I said that the Power of the Test isn't a random variable

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Without answering the question directly (since being in a class requires some thought on your part ;)), one of these can be calculated at the design (planning) stage before the data is collected for testing, so you essentially answered the question already.

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