PSYC 210 Chapter Notes - Chapter 8: Null Hypothesis, Standard Deviation, Effect Size
18 Nov 2012
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Chapter 8 summary and vocabulary t test for independent means. For hypothesis-testing with scores from two entirely separate groups of people. Comparison distribution for t test for independent means. A distribution of differences between means of samples. Built up in two steps: each population of individuals produces a distribution of means, a new distribution is created of differences between pairs of means selected from these two distributions of means. The distribution of differences between means has a mean of 0 and is a t distribution with the total of the degrees of freedom from the two samples. Steps for a t test for independent means: restate the question as a h1 and h0 about the populations, determine the characteristics of the comparison distribution. If the exact df is not given, use the df below it: determine your sample"s score on the comparison distribution, decide whether to reject h0 by comparing the scores from steps 3 and 4.
