Using four methods to teach ANOVA, do these four samples differ enough from each other to reject the null hypothesis that type of instruction has no effect on mean test performance? Method to teach ANOVA | Mean SD N method 1 (single teacher) 4.85 0.360 34 method 2 (co-teachers) 4.61 0.715 31 method 3 (computer) 4.61 0.688 36 method 4 (lab) 4.38 0.793 32 Since we are comparing more than 2 groups, we will use ANOVA to test whether the data provide evidence that SAT score is related to study strategy. The following hypotheses were tested: Ho: M1 = 12 = 13= H4 Ha: M1, M2, M3, M4 are not all equal The analysis was run on the data and the following output was obtained: Source SS df MS F p Teaching Method 130 3 43.33 86.66