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This question already has an answer here:

I am conducting an experiment with a control group and a treatment group. Both groups will take a pre and post treatment depression inventory. What statistical procedure do I use to determine if the treatment reduced depressive symptoms significantly? T-test or ANOVA, which kind and why?

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merged by chl Nov 5 '14 at 15:19

This question was merged with Best practice when analysing pre-post treatment-control designs because it is an exact duplicate of that question.