10%20t_Test_Independent_outline

10%20t_Test_Independent_outline - 1 2 3 4 5 6 7 t Test for...

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1 t Test for Two Independent Samples t Test for Two Independent Samples • Null and Alternative Hypotheses t ratio –Pooled variance –Estimated standard error –Degrees of freedom • Assumptions • Cohen’s d • Proportion of Variance Accounted for t Test for Two Independent Samples • Previous t test for one sample compared a single sample mean to a hypothesized population mean • What if we want to compare the means of two samples to determine if the samples are significantly different (not different just by chance)? Comparing Samples Independent-measures design: • Common research design • Different randomly-selected samples experience different versions of a treatment or manipulation –e.g., one group receives Treatment A, the other B Before Treatment Before Treatment Comparing Samples Independent-measures design: • Common research design • Different randomly-selected samples experience different versions of a treatment or manipulation –e.g., one group receives Treatment A, the other B • A dependent variable that is relevant to the manipulation is then measured • The scores are then compared • Also called a between-subjects design 1 2 3 4 5 6 7
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2 Comparing Samples Independent-measures design: • because the samples consist of different people, they are considered to be independent of one another • likewise, the groups of scores obtained from the samples are considered independent of one another Comparing Samples Independent-measures design:
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