PSYCH101 Lecture Notes - Lecture 13: Standard Deviation, Statistical Parameter, Statistic

• School: University of Waterloo
• Department: Psychology
• Course: PSYCH101
• Professor: Paul Wehr

Document Summary

Psych 101 research methods in behavioural science wednesday feb 1st. Three criteria to establish cause & effect relationship. Temporal precedence cause must precede effect. Covariation cause and effect must occur together. Covariation- cause is present the effect is present (cause is absent then effect is absent) Must smoke first, then get cancer for s(cid:373)oki(cid:374)g to (cid:272)ause (cid:272)a(cid:374)(cid:272)er, (cid:272)a(cid:374)"t ha(cid:448)e (cid:272)a(cid:374)(cid:272)er a(cid:374)d start s(cid:373)oki(cid:374)g (temporal precedence) When the cause is present, the effect is present, when the cause is absent, effect is absent (covariation) In order to establish a cause and effect relationship all 3 criteria should be satisfied. Temporal p. - we do not know what came first, we cannot establish cause and effect (what may have influenced what) Confound is the third variable in the experiment: length of viewing can cause a person to be aggressive as well. Might be individual differences between those who choose to watch. Friends is 30 min, narcos is 1 hr.