PSYCH 312 1st Edition Lecture 10 Outline of Last Lecture I. Statistical hypothesis testing II. Threats to internal validity Outline of Current Lecture I. Confound vs. extraneous question treeCurrent Lecture - Is this a variable other than the Iv that could affect the DV?o No Then there is no need to worry about ito Yes Does it vary systematically with the IV OR does it vary non-systematically with the IV- Varies systematically with IVo CONFOUND Variable will increase BETWEEN-GROUP variability/variance- Create differences in DV across each condition—posing as a treatment effect by IV even though there isn’t oneo Increase the risk of a TYPE I ERROR (concluding there is a treatment effect when there isn’t one)- Varies non-systematically with the IVo EXTRANEOUS variable Variable will increase WITHIN-GROUP variability/variance (noise)- Create differences in the DV within each condition, but not across conditions. Increased “noise” makes it hard to detect a treatment effect when there is one. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o Increases the risk of a TYPE II ERROR (concluding there is NO treatment effect when there is
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