PSY 281 Lecture 8: PSY 281 (STATS) SDSU, Lecture Notes CH 7 Part 2 Paired Samples T Test using SPSS
Document Summary
Chapter 7 part 2: paired samples t-test: from a one-sample to a two-sample design. Looking at information collected from 2 samples to tell us something about 2 populations. These tests can either involve paired or independent samples. Ch 7 part 2 talks about paired samples, ch 7 part 3 is independent samples: two-sample hypothesis testing. Actually something that happens much more commonly than one sample testing. With one-sample t-test, we need to know (or estimate) the population mean, which we rarely know. Much more common to do tests involving 2 samples and making a comparison: the paired-samples t-test. Used to compare 2 means for within-groups design in which every participant is in both samples. Uses different scores for every participant and the distribution of mean differences. The steps for the paired-samples t-test are similar to those for the single-sample t-test. In a single-sample t-test, sample mean of scores is compared to the population mean according to the null hypothesis.
