FRHD 3070 Chapter Notes - Chapter 9: Internal Validity, Interrupted Time Series, Hawthorne Effect

• School: University of Guelph
• Department: Family Relations and Human Development
• Course: FRHD 3070
• Professor: Hendry

Document Summary

In other types of approach, causation is implied. Judgement can be developed from reading research reports, understanding strengths & weaknesses of diff techniques, assisting more experienced researchers w/ their research & gaining practical experience. In order to be compared, the 2 groups must be similar in most respects. Why randomly assign: random assignment: dividing subjects into groups @ the beginning of experimental research using random processes, so experiment can treat the groups as equivalent. It"s a (cid:449)a(cid:455) to di(cid:448)ide/so(cid:396)t (cid:272)olle(cid:272)tio(cid:374) of (cid:272)ases i(cid:374)to (cid:1006) g(cid:396)oups to i(cid:374)(cid:272)(cid:396)ease o(cid:374)e"s (cid:272)o(cid:374)fide(cid:374)(cid:272)e that g(cid:396)oups do(cid:374)"t differ in systematic way. It"s a (cid:373)e(cid:272)ha(cid:374)i(cid:272)al (cid:373)ethod; the assig(cid:374)(cid:373)e(cid:374)t is auto(cid:373)ati(cid:272) & (cid:396)esea(cid:396)(cid:272)he(cid:396) (cid:272)a(cid:374)"t (cid:373)ake assig(cid:374)(cid:373)e(cid:374)ts o(cid:374) (cid:271)asis of personal preference or features of specific cases. In random assig(cid:374)(cid:373)e(cid:374)t, the(cid:455) so(cid:396)t (cid:272)olle(cid:272)tio(cid:374) of (cid:272)ases i(cid:374)to (cid:1006) g(cid:396)oups usi(cid:374)g (cid:396)a(cid:374)do(cid:373) p(cid:396)o(cid:272)ess. In random sampling, they select smaller subset of cases from larger pool of cases.