PSYC 230 Lecture Notes - Lecture 22: Internal Validity
22 Jan 2020
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Document Summary
Read the chapter then use the slides to guide. The relative accuracy or correctness of a psychological statement. Tries to answer whether the measurements measure what they are supposed (or claim) to measure. Takes a variety of forms and has a range of different meanings. Two types of validity - internal and external. The extent to which a set of research findings provides compelling info about causality. Confidently concluding that a is causing b. Confidently concluding that variations in the independent variable caused the observed changes in the dependent variable. In order to establish it, one needs We manipulate a, there is a change in b. We want to make sure there is no third variable. If there was a drought prior, the opposing political party vs the president won the election. If there was no drought prior, the president won reelection. Agricultural america -> drought led to angrier people who blamed unhappiness on president -> new president.
