A psychologist was looking at the effects of an intervention on depression levels. Three groups were used: waiting list control, treatment and post-treatment (a group who had had the treatment 6 months before). The SPSS output is below. Based on this output, what should the researcher report?
A. The treatment groups did not have a significant effect on depression levels, F(2, 26.44) = 4.35.
B. The treatment groups had a significant effect on depression levels, F(2, 45) = 5.11.
C. The treatment groups did not have a significant effect on the change in depression levels, F(2, 35.10) = 5.11.
D. The treatment groups had a significant effect on the depression levels, F(2, 26.44) = 4.35.
Answer: D
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