HED 373 Lecture Notes - Lecture 7: Olive Oil, Operational Definition, Random Assignment
3 Apr 2017
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Empirical approach: based on observations, often has misinterpretations & misleads. When to collect data to obtain most valid results. Experimental vs nonexperimental studies/experimental vs. causal-comparative studies (topic 2 & 3) Experimental research: gives treatments/interventions & observes if they cause an effect (exploring cause-effect relationships: random selection + random assignment + control group= true experiment. Non-experimental research: no treatment/intervention given, observes participants in natural existence, common types= surveys or polls, sometimes not possible due to ethical/physical/legal/financial reasons so use a . Causal-comparative (ex post facto) study- observing & describing some current condition then looking to the past to identify possible causes but . Variables in nonexperimental & experimental studies (topics 5 & 6) Non-experimental studies: don"t physically manipulate iv but observe their association to the dv. Independent variable (iv): stimulus, input, predictor causes change in dv, manipulated by experimental conditions. Dependent variable (dv): outcome, criterion, observed for changes.
