Term
| treatment group (this is the independent variable) |
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Definition
| groups being manipulated are called the |
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Term
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Definition
| groups not being manipulated are called the |
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Term
| threats to internal validity |
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Definition
| factors effecting the effects of the independent variable |
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Term
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Definition
| particularly problematic if subjects with certain characteristics leave |
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Term
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Definition
| a naturally occurring event that threatens the effect of the independent variable |
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Term
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Definition
| changes in measurement or observer |
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Term
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Definition
| changes in the participants over time |
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Term
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Definition
| how participants are assigned to groups (optimal method is random assignment) |
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Term
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Definition
| change of responses based on exposure to testing |
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Term
| threats to external validity |
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Definition
| external validity is the extent to which the results are generalized |
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Term
| reactive effect of testing |
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Definition
| the mere act of testing the subject influences the subject's reaction to the treatment or the effect of the treatment |
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Term
| interaction of selection and treatment |
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Definition
| occures without reandom selection. if participants self-select for inclusion example in book is premarital course may look more effective than is because self selection of participants who are more invested in treatment |
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Term
| reactive effects of experimental arrangements |
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Definition
| people who are aware they are in an experiment behave differently than they otherwise would (the hawthorne effect) |
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Term
| multiple treatment interference |
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Definition
| multiple treatments offered to the same subjects |
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Term
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Definition
| conducted under highly controlled conditions |
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Term
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Definition
| often conducted as part of a social or educational program |
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Term
| large sample size, usually close ended questions, responses are coded and analyzed |
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Definition
| characteristics of survey methods |
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Term
| response rate, interviewer bias, flexibility, quality control, and cost |
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Definition
| concerns of survey methods |
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Term
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Definition
| relatively low cost, response rates typically less than 75%, may have over or under representation of certain groups |
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Term
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Definition
| relatively low cost(typically more than mailed questionaire), higher quality control, high response rates, may have over or under representation of certain groups |
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