PSYC 202 Lecture Notes - Lecture 18: Null Hypothesis, Hypothesis, Type I And Type Ii Errors
Document Summary
Logical method, developmental trends, continuous, you study the same group throughout time, difficulty of this is that you get drop off since it"s the same group over time. Three basic ways of describing results: comparing group percentages, individual scores, group means. Scales of measurement: discrete qualitative, nominal, orderinal, continuous quantitative, interval, ratio, chapter 13 statistical inference, one hot toddy - observe hypothesize test, experimental v. nonexperimental goals. Experimental: seeks to establish cause in the relationship, non-experimental, describes a relationship, probability (p) Alpha level (typically . 05) is set by researcher: other common = . 01 - stringent, . 10 -relaxed, multiply by 100% it tell you that the results is due to chance, if the null hypothesis is true. 05 is the criterion for rejecting the null. The truth about p: if the null hypothesis is true, obtaining the extreme results by chance (basically), statistical decisions. P < . 05 significant: reject the null. P > . 05 non significant: fail to reject the null.
