PHY 7B- Final Exam Guide - Comprehensive Notes for the exam ( 32 pages long!)
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Take a representative sample of study units. Randomize the study units into treatment/control group (randomized controlled ) Use placebo and don"t let study subjects know that whether they get treatment or placebo. Don"t let evaluators know who gets treatment or placebo (double-blind) Evaluate and compare the responses from the two groups. Because of randomization, two groups will be similar except for the treatment. Hence, if there is a di erence in the responses, then this is likely caused by the treatment. Experimental study: a study based on deliberately imposing some treatment(s) on individuals to observe their responses. Investigators decide who will be in the treatment group and who will be in the control group. Observational study: a study based on observing individuals and measuring responses but does not attempt to in uence responses. Because controlled experiments are sometimes hard to do or.
