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Definition
| Exists if the observed effects of the independent variable on the dependent variable are real and not caused by extraneous factors |
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Definition
| The ability to generalize the study results to other groups and settings beyond those in the current experiment |
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Term
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Definition
| an event occurring between pretest and posttest other than the independent variable that could affect the dependent variable. |
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Definition
| Changes occurring in participants because of passage of time |
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Term
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Definition
| taking a pretest somehow affects the taking of the posttest |
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Definition
| Instruments are not accurate/precise enough or do not measure what they are supposed to measure |
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Term
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Definition
| participants selected in a non-random manner differ in some way |
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Definition
| using intact groups that vary in some element of maturity |
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Term
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Definition
| extremely high or extremely low scores regress toward mean |
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Definition
| participants drop out of the study or cannot be located |
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Definition
| Altered behavior due to the effects of being studied and observed |
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Definition
| Altered behavior because of expectations |
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Definition
| Treatment of experimental group spills over to comparison or control groups |
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Term
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Definition
| The location of program or data collection affects participant responses |
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Term
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Definition
| differences in persons presenting a program affect the program |
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