PSYC 2002 Lecture Notes - Lecture 8: Repeated Measures Design, Pooled Variance, Type I And Type Ii Errors

• School: Carleton University
• Department: Psychology
• Course: PSYC 2002
• Professor: Angel Mackenzie

Document Summary

Single sample t-test: cis & effect size, assumptions. Independent samples t-test: development of formula for independent samples t-test. Independent-samples t-tests: examples, assumptions, power, confidence intervals, effect size, *tdist function in excel calculating p-value. Analysis of variance (anova): intro to anova, underlying structure of anova, calculation of anova components, hypothesis testing using anova. Hypothesis testing with independent sample t-test: final formula. Because: we"re assuming that 1 2 = 0 (under null hypothesis, and, where: Class version versus nh independent sample t-test formulas: Pooled variance: class version uses ss, nh use s2. Standard error: se calculated slightly differently in class & in nh, slightly diff notation: vs. sdifference. Differences in aggression b/w boys whose parents are divorced (n = 17) vs. boys whose parents aren"t divorced (n = 15) were measured. Dependent variable was # of aggressive acts over 2-week period. M1 (divorced) = 40; ss1 = 256. M2 (not divorced) = 35; ss2 = 252.