PSYCH 2220H Lecture Notes - Lecture 10: Confidence Interval, Test Statistic, Standard Deviation
19 Aug 2016
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Chapter 10: paired samples t-test: comparison distribution, single sample t. Take difference between 2 group means, find distribution: paired sample t. Take mean before, take mean after, get difference, find distribution. New technique to help students take tests more quickly. Will students have a difference in test-taking time before. Paired samples t test b/c have 2 samples of scores and each participant contributes to both samples. No evidence for non-normal distribution: step 2. H0: d = 0 or 1 = 2. H1: d 0 or 1 2: step 3: comparison distribution. Mean: if 1 = 2 then 1 2 = 0, so mean of comparison distribution is 0. Take standard deviation of difference scores, not raw scores, then divide by radical n: step 4: critical values. Two-tailed test, alpha of 0. 05, df = n-1. Reject null if tobs > 2. 145 or < -2. 145. Students" test taking time was different after the.
