PSYC 51a Lecture Notes - Lecture 10: Pooled Variance, Variance, Null Hypothesis
10 Mar 2017
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One to two sample t test the questions. Research questions differ from the one sample t-test. Different subjects tested with only one level of independent variable. Each subject gets only one treatment (e. g. assigned to either control or experimental group) H0 and h1 deal with differences between two populations. The test examines the differences between two samples expressed in terms of pooled variability. Use data from two samples to evaluate the mean differences between two populations (between subjects design) Want to know whether the means of the two samples differ (whether the means of these two populations differ one another - statistical way) The t-test for two independent samples is: the difference between means of two populations. The null hypothesis: there is no difference between the two means / the difference between the two means is zero. Usually used when you have one sample, tested at two different times or conditions. Uses the sample individuals twice (within subjects design)
