Term
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Definition
| An event occuring between pretest and posttest other than the independent variable that could affect the dependent variable |
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Term
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Definition
| Changes occuring 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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Term
instrumentation
(Internal) |
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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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Term
selection maturation
(Internal) |
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Definition
| using intact groups that vary in some element of maturity |
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Term
statistical regression
(Internal) |
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Definition
| extremely high or extremely low scores regress toward mean |
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Term
mortatlity/attrition
(Internal) |
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Definition
| participants drop out of the study or cannot be located |
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Term
Hawthorne Effect
(Internal) |
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Definition
| altered behavior due to the effects of being studied or observed |
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Term
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Definition
| altered behavior because of expectations |
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Term
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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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Term
Selection Treatment Interaction
(External) |
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Definition
| the ability of the researcher to generalize the results of a study beyond the groups involved |
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Term
Setting Treatment Interaction
(External) |
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Definition
| the extent to which the enviornmental conditions or setting under which an experimental study was conducted can be duplicated in other settings |
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Term
Setting Treatment Interaction
(External) |
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Definition
| the extent to which the enviornmental conditions or setting under which an experimental study was conducted can be duplicated in other settings |
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Term
History Treatment Interaction
(External) |
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Definition
| Develops when the researcher tries to generalize findings to past and future situations |
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