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How do you think attrition affects validity

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How do you think attrition (the dropping out of participants from your study while the study is underway) affects validity? Does it? If so, how much of a problem might it be? In your readings, did you come across the % of attrition at which we need to start worrying that something might be amiss? If we lose a few people, is it an issue? If we lose a few more, what then? When does it start to become critical? And why might that be?

Reference no: EM133350732

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