PSY 301 Lecture Notes - Lecture 15: Mythbusters, Internal Validity, Measuring Instrument
17 Nov 2018
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You always need a control group in an experiment. You need a comparison group, but it doesn"t have to be a control group. You always need a pre-test in an experiment. You need a random sample in an experiment. Internal validity is prioritized over external validity. Iv: question that was asked, dv: how focused they were. Third person condition: checking for potential third-variable. Internal validity: choosing who they were made the variable less consistent, which could vary results. Iv: tracking or not, dv: purchase of reusable water bottle. Internal validity: selection effect, groups are systematically different. Iv: watching the video or not, dv: number of healthy food choices. Iv: which game is played, dv: score on burt reading test. Internal validity: design confound, systematic differences, due to teacher being different. Design confound: another variable varies systematically along with the iv, aka differences in the environments. Have a control variable that applies to all ivs.
