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A psychologist was looking at the effects of an intervention on depression levels

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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 change in depression levels over the time of the treatment was recorded (although bear in mind that only the treatment group actually got any treatment during this time). Which statistical test should the psychologist use in analyzing the data?