PSYCH 2220H Lecture 11: Chapter 11 (Lecture)
19 Aug 2016
School
Department
Course
Professor
Document Summary
Each participant is only in one group: sampling distribution of the differences between means. To find variance, we will create something called pooled variance. Variance of sun or difference of 2 independent variables = sum of their variances. Hypothesis test for independent samples t-test: step 1. Populations: asleep for 10 hours, awake for 10 hours. Test: independent sample t-test b/c have two samples with different people in each. Need to determine appropriate mean and standard error. Mean: if 1 = 2 then 1 - 2 = 0, so mean of comparison distribution is zero. If n1 n2, then need to weight the estimate of variance. If sample sizes are unequal, pool the variances. Reject h0 if tobs > 2. 846 or tobs < -2. 846: step 5. But 1- 2 will always equal 0: step 6. F. 2. tobs = 5. 06 > 2. 846 = tcrit. There is a significant difference in word recall between awake and.
