PSY 2106 Lecture Notes - Lecture 9: Statistical Hypothesis Testing, Null Hypothesis, Sampling Distribution

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2106
• Professor: Brenda Baird

Document Summary

Lecture 9 the t-test for two independent variables. Remember: z-score have x, , , z-test have m, , , t-test have m, , s. Independent measures: the t-test for two independent samples terminology. Samples and populations: fandom samples are drawn from a population, the administration of the iv causes the samples to differ significantly, the experimenter generalizes the results form the experiment to the general population. Because neither of the two population means is known, it will be necessary to take two samples, one from each population. The first sample will provide information about the mean for the first population, and the second sample will provide information about the second population. Independent-samples t-test: numerator shows the expected value according to h0, denominator shows the standard error of the difference between means (chance, this will be estimated based on the sample variance (but now we have 2 samples)