Chapter 8 Lecture Notes

Chapter 8 Lecture Notes - Chapter 8 I. Confounding and...

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Chapter 8 I. Confounding and internal validity A. Confounds are a threat to internal validity B. Something that causes a systematic change in behavior, but that is not controlled or manipulated 1. Something changes the independent variable, but it’s not something you were planning on C. A violation of internal validity (the experiment results are invalid because you do not know the cause D. There’s two different groups, one exercising and one non-exercising. However, the researcher didn’t realize until the end that they came from two different areas on campus. The non-exercising people were form the dorms while the exercising people are from the scholarship halls. E. Three types of confounds 1. The actual experiment produces no effect, but the confound produces an effect a. It’s in the same direction you’re looking for b. Exercising was pointless, but the scholarship halls went on a diet at that same time and that’s the effect you saw 2. Your manipulation has an affect, but the confound goes to the opposite direction of your manipulation so at the end of your experiment you don’t have anything a. This is BAD because scientists are less likely to retest areas when they have no results b. Scholarship hall people are losing weight due to exercise, but eating a ton
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Chapter 8 Lecture Notes - Chapter 8 I. Confounding and...

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