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Lecture 5 - Validity - Validity Validity I II III IV Are...

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Validity
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Validity Are the researcher’s conclusions correct? Do they correspond to the actual state of the world? I. Internal II. Construct III. External IV. Statistical
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I. Internal Validity Did the independent variable cause the dependent variable to change? Have to be careful of confounding variables (i.e. error that occurs when the effects of two variables can’t be separated). Confounding variables are more prevalent when conditions are based on subject variables.
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Internal Validity Threats 1. Events outside the laboratory 2. Maturation 3. Effects of testing (practice, fatigue) 4. Regression to the mean 5. Selection 6. Mortality
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What is wrong with each of the following, what is the threat to validity? 1. Researchers are looking at the effects of reading material on mood. The control group (n = 50) is given neutral material on Tuesday and their mood is measured. The experimental group (n = 48) was given sad material on Monday.
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Internal cont.
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