HED 373 Lecture Notes - Lecture 3: Olive Oil, Experiment, Asso
3 Apr 2017
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Empirical approach: based on observations, often has misinterpretations & mis- leads. When to collect data to obtain most valid results. 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 partici- pants 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 . Dangers in data interpretation: common cause & subjects unmatched. Example of common cause- smoking & lung cancer smoking > lung cancer? but perhaps stress -> lung cancer? so what if stress > smoking > lung cancer. Survey (or poll): describes attitude, beliefs, & behavior; a census studies all members of a population. Case study: knowledge of one individual over a long period.
