PSYCH 2220H Chapter Notes - Chapter 11: Normal Distribution, Confidence Interval, Test Statistic
19 Aug 2016
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Chapter 11: the independent-samples t test: conducting an independent-samples t test, used to compare to means for a between-groups design, a situation in which each participant is assigned to only one condition, a distribution of differences between means. We randomly select 3 cards, replacing each after selecting it, and calculate the mean of the heights listed on them; this is the first group. We randomly select 3 other cards, replacing each after selecting it, and calculate their mean; this is the second group. Repeat many more times: the six steps of the independent-samples t test. Comparison distribution = distribution of differences between means. Based on null hypothesis that posits no mean difference. Pool the variances; taking average of two sample variances while accounting for any differences in the sizes of the two samples. Weighted average of the two estimates of variance one from each sample that are calculated when conducting an independent-samples t test.
