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Randomly students parents unaware of label high

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Unformatted text preview: ity External The Experimental Approach - An Example: Rosenthal & Jacobsen Example: Teacher Expectancy Change in IQ Score •“Bloomer” label assigned randomly + students /parents unaware of label = High Internal Validity Internal •Sample of varied ethnicity, ability etc. + Real classroom, real IQ tests = High External Validity External Did Rosenthal & Jacobsen Did prove SFP to be true? • • • • Could this outcome be due to chance Could variation and not the effect of the IV? What is the likelihood that this outcome is What due to chance? due If it’s < 5% (i.e., p < .05), we decide that the If result is statistically significant statistically What factors affect significance? • Magnitude of effect • Variability in data • Sample size We NEVER prove anything in We psychological research because We study samples, not populations We We draw inferences about populations We us...
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