PSY 418 Chapter Notes - Chapter 10: Demand Characteristics, Formal System, Latin Square
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Independent and dependent variables: manipulated variable = independent, a stud(cid:455)"s i(cid:374)depe(cid:374)de(cid:374)t (cid:448)aria(cid:271)le should (cid:374)ot (cid:271)e (cid:272)o(cid:374)fused (cid:449)ith its le(cid:448)els, (cid:449)hi(cid:272)h are referred to as conditions, measured variable = dependent. I(cid:374)depe(cid:374)de(cid:374)t (cid:448)aria(cid:271)les a(cid:374)s(cid:449)er, (cid:862)(cid:272)o(cid:373)pared to (cid:449)hat? (cid:863: comparison groups are necessary, unless you have a comparison group you have nothing to compare your data to so it"s useless. If the pasta e(cid:454)peri(cid:373)e(cid:374)t o(cid:374)l(cid:455) (cid:449)eighed o(cid:374)e (cid:271)o(cid:449)l size the data (cid:449)ould(cid:374)"t tell us a(cid:374)(cid:455)thi(cid:374)g: covariance. In matched groups, researchers measure the participants on a particular variable that might matter for the dependent variable and assign them into groups accordingly (but still kinda randomly: has the advantage of randomness. Idea of (cid:862)treati(cid:374)g ea(cid:272)h patie(cid:374)t as his or her o(cid:449)(cid:374) (cid:272)o(cid:374)trol(cid:863: gave researchers more power to notice differences between conditions. Researchers decide who gets what order through random assignment: two methods for counterbalancing; full and partial, full counterbalancing is used when there is only 2 or 3 levels of the independent variable.
