PSY 121 Lecture Notes - Lecture 3: Random Number Generation, Internal Validity, Confounding
Document Summary
Occurs when the effects of an iv and an uncontrolled variable are intertwined and you cannot ascertain which of the variables is responsible for the observed effect. (not intentionally done by experimenter) Ex) crowded v. uncrowded room on cognitive performance. The difference in cognitive performance could be. When the results of the experiment can be confidently attributed to the caused, in part, by the window variable. effect of the iv. Only the iv can be the cause of the effect. Simplest design has 2 variables and you need 2 levels to have a variable. Measure the effect of the iv and dv. Measure effect of the iv and dv. Strengths: high internal validity and ensures equivalency. Weakness: mortality and sensitizing participants to hypothesis. Two of each group (2 treatment, 2 control) Measure participants before the manipulation and then again afterwards. History: anything that happens outside of the experiment. that has an impact on the experiment.
