Do Now Watch the placebo effect video https://www.youtube.com/watch?v=yfRVCaA5o18.

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Presentation transcript:

Do Now Watch the placebo effect video https://www.youtube.com/watch?v=yfRVCaA5o18

Placebo Effect and Double-blind Experiments Unit 1: Univariate Data

Objectives The impact of the placebo effect on confounding and how a double-blind study can prevent it

Antidepressants and the Placebo Effect In an experiment, researchers examined the effects of taking a new antidepressant on clinically depressed patients. Patients were randomly assigned to one of two groups: the first group took the antidepressant, and the second group did not. A psychologist, not knowing which patient was assigned to which group, reported on the positivity level of each patient. Researchers concluded that those taking the antidepressant had a higher level of positivity than those not taking the drug.

Antidepressants and the Placebo Effect 85% of depressed patients reported feeling happier  after taking the antidepressant. Is this a psychological reaction to the treatment, or are the antidepressants truly working?

The Placebo Effect Placebo Effect: the psychological effect of any treatment Using a placebo helps us measure the effect of the explanatory variable on the response variable, controlling for a natural reaction to any treatment.

Antidepressants and the Placebo Effect This time we give the control group a placebo pill and the treatment group to antidepressant. The control group reports feeling 45% happier, and the treatment group reports feeling 85% happier. How much of the change in the treatment group can be explained by the placebo effect?

Preventing the Placebo Effect Double-blind experiment: neither the subjects nor those who interact with them and measure the response variable know which treatment a subject received Single-blind experiment: one side, the subjects or those measuring the response variable, know who is receiving the treatment and who is receiving the placebo

Did we accomplish our objective? Have a student (cold call) attempt to connect objective to their career/field of study.

Independent Practice and Homework Gallup Poll or Harris Poll on Senior Project Topic

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