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Figure 1: Diagrammatic representation of the concept of the null hypothesis and error types. Note that α and β denote the probabilities, respectively, of Type I and Type II errors. The happy faces represent error-free decisions

Figure 1: Diagrammatic representation of the concept of the null hypothesis and error types. Note that α and β denote the probabilities, respectively, of Type I and Type II errors. The happy faces represent error-free decisions