Biology 2244A/B Lecture 2: Lecture 2- Study Designs

• School: Western University
• Department: Biology
• Course: Biology 2244A/B
• Professor: Jennifer Waugh

Document Summary

Just (cid:271)e(cid:272)ause there is a relatio(cid:374)ship (cid:271)et(cid:449)ee(cid:374) t(cid:449)o thi(cid:374)gs, does(cid:374)(cid:859)t (cid:373)ea(cid:374) that o(cid:374)e thi(cid:374)g caused the other: (cid:449)e (cid:272)a(cid:374) o(cid:374)l(cid:455) (cid:272)lai(cid:373) a(cid:374) (cid:862)asso(cid:272)iatio(cid:374)(cid:863) (cid:271)et(cid:449)ee(cid:374) (cid:272)ertai(cid:374) (cid:448)aria(cid:271)les, (cid:272)a(cid:374)(cid:859)t (cid:272)lai(cid:373) (cid:272)ause a(cid:374)d effe(cid:272)t i(cid:374) o(cid:271)ser(cid:448)atio(cid:374)al studies. Other variables that can contribute to longevity [housework article: age, higher socioeconomic status, have more time to do housework, eat better, exercise more frequently. Worr(cid:455) a(cid:271)out (cid:862)(cid:272)ofou(cid:374)di(cid:374)g (cid:448)aria(cid:271)les(cid:863: other variables than the one(s) we are interesting in, that could have an effect on the response variable, mi(cid:454)ed i(cid:374), a(cid:374)d (cid:272)a(cid:374)(cid:859)t separate the effe(cid:272)t of (cid:272)ofou(cid:374)di(cid:374)g (cid:448)aria(cid:271)le a(cid:374)d our respo(cid:374)se (cid:448)aria(cid:271)le. Effects of cofounding variables are mixed up with the effects of our variable(s) of interest. Housework article: cofounding variables; socioeconomic status, diet, response variable; longevity, variable we are studying; amount of housework. Environment (where they dropped the glove) was controlled. Dropping the glove many times in front of more than one person, more than. 1 person deciding to pick up the glove or not.