PSY 250 Lecture Notes - Lecture 9: Random Assignment, Quasi, Interrupted Time Series
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Implies that it is different from experimental: manipulation of iv, statistical analysis, random assignment. Everyone in your study has equal change of getting into either group. At times not feasible: depends on research question. When its not possible or ethical to manipulate iv. Ex: second hand smoke exposure on children. Making sure that what you sa(cid:455) (cid:455)ou"(cid:396)e testi(cid:374)g, (cid:455)ou(cid:396) a(cid:272)tuall(cid:455) testi(cid:374)g. Exists on a continuum: correlational lowest, quasi mid-way. Ca(cid:374)"t (cid:396)a(cid:374)do(cid:373)l(cid:455) assig(cid:374) people to g(cid:396)oups (ge(cid:374)de(cid:396) diffe(cid:396)e(cid:374)(cid:272)e, d(cid:396)ug treatment: experimental- highest. Only involves one variable: no relationship. Can answer several questions: occurrence of behavior/emotion, frequency. Looking at two variables rather than just one. Relationship between two variables that are not manipulated: little to no consideration of third variables, dv1 correltated to dv2? (how related, quantitative or categorical variables. Types: naturalistic observation field research, observing, unobtrusive as possible. Requires coding of behaviors and evaluating interrater reliability: archival data data have already been collected.
