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The Level of Significance (also known as the Alpha Level) was discussed in Chapter 7 and shown to correspond to the probability of a Type I error (rejecting a null hypothesis when it is true). Decisions about the magnitude ofalpha may vary, especially as it relates to hard sciences or to social sciences.For example, a medical trial for cancer treatments typically conducts statistical tests at a level of 0.0001 – so for every 1 out of 10,000 patients

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