If you were to look at differences between two independent groups, what steps would you take using Figure 9.1?

Data From Figure 9.1

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True nature of the null hypothesis The null hypothesis is really true. 1 Action You Take Accept the Null Hypothesis Bingo, you accepted a null when it is true and there is really no difference between groups. 2 Reject the Null Hypothesis Oops you made a Type I error and rejected a null hypothesis when there really is no difference between groups. Type I errors are also represented by the Greek letter alpha, or a. The null 3 4 Uh-oh-you Good job you made a Type II error hypothesis and accepted a false is really false. null hypothesis. Type II errors are also represented by the Greek letter beta, or . rejected the null hypothesis when there really are differences between the two groups. This is also called power, or 1-.