PSYC 301 Lecture Notes - Lecture 10: Intact Media Group, Interrupted Time Series, Internal Validity
20 Aug 2016
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Document Summary
Chapter 10: quasi-experimental designs and program evaluation applied research. Program evaluation: applied research to learn whether real-world treatments work characteristics of true experiments. Manipulate iv: treatment comparison conditions, high degree of control. Unambiguous outcome regarding effect of iv on dv obstacle to conducting true experiments in natural settings. Permission: difficult to gain permission and to access participants. Random assignment perceived as unfair: people want a treatment, us waiting list control group or alternative treatments advantages of true experiments: 8 general threats to internal validity are controlled: History: when an event occurs at same time as treatment that changes participant"s behavior. Testing: taking a test generally affects subsequent testing. Instrumentation: instruments used to measure participant"s performance may change over time. Regression: individuals sometimes perform very well or very poorly due to chance, chance factors are not likely present during 2nd testing, scores will regress toward mean.
