PSYC 217 Lecture Notes - Lecture 9: Interrupted Time Series, Repeated Measures Design, Caffeine
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Example: giving caffeine energy drink to friend with fatigue. Only one person, which means there"s a lack of generalizability. It could have been anything else to have caused changes. What characteristic makes it impossible to use a true experimental design. Participants chose whether to sign up or not. Uses pre-existing groups (or allows participants to sort themselves into groups. >> smoking frequency 1 pack/week and 3 packs/week (posttest) >> students who sign up and didn"t sign up (participant group) >> smoking frequency 4 packs/week and 4 packs/week (pretest) >> smoking cessation program and no program (treatment) >> smoking frequency 1 pack/week and 4 packs/week. >> smoking frequency 1 pack/week and 4 packs/week (posttest) Can deal with multiple discrete groups without inherent order. Can only deal with two discrete groups without inherent order. Any external event happening that affected participants (especially between first and second measurements) People change over time (fatigue effect, get hungrier, more mature, etc.
