PSYB01H3 Chapter Notes - Chapter 8: Design Of Experiments, Dependent And Independent Variables, Internal Validity
Document Summary
Chapter 8: experimental design experimental method controls for extraneous variables. Experimental method is a vital and versatile tool in the researcher"s toolbox the. E. g. you want to test hypothesis on crowding on cognitive performance one group put in a crowded room, others in uncrowded room. Confounding variable=> varies along with the iv; confounding occurs when the effects of the iv and an uncontrollable variable are intertwined so that you cannot determine which of the variables is responsible for the observed effect. Planning a basic experiment: the simplest possible experimental design has 2 variables: the independent variable (iv) and dependent variable (dv) Experiments in which there is one iv that has 2 levels: experimental group and control group. Researchers should make sure the only difference b/w the 2 groups is the manipulated variable. Researcher using experimental design must: (1) obtain 2 equivalent groups of participants, (2) introduce the iv, and (3) measure the effect of the iv on the dv.
