STAT 100 Lecture Notes - Lecture 3: Random Assignment, Dependent And Independent Variables
Document Summary
Observational study: can only conclude possible relationships or associations. Experimental study: can conclude possible cause. Explanatory variable: variable should affect some outcome. Treatment levels: factor levels of a treatment. In experiment, the treatment variable = explanatory variable. Experimental units: subjects to which a treatments is assigned. Single blind study: subjects are blinded to what treatment they are receiving. Placebo- when a pill with nothing in it/sugar pill is given without the person knowing that they aren"t actually being treated. Psychologically there is an impact even when a placebo is given. Double blind study: subjects and researchers are blinded. Blinding of researcher is done to avoid the experimenter affect. Need random sample to extend to total population.
