11_2_sample_t - The two-sample t-test Expanding t to two...

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Unformatted text preview: The two-sample t-test Expanding t to two groups t-tests used for population mean diffs With 1-sample t , we have a single sample and a population value in mind With 2-sample t , we have two groups. Experimental vs. Control Drug vs. placebo Psychotherapy, wait list New training, status quo Brand Preference Pepsi, Coke Coors, Red Stripe Male, Female Husband, wife; Brother, sister; Sorority, fraternity Use samples to decide about populations treatment effectiveness, differences between brands, groups Varieties of t 1-Sample (only one kind) 2-Sample (two kinds) Independent samples groups are unrelated Experimental vs. control groups (at random) Male vs. female participants (unrelated) Dependent samples groups are related Same person in both groups Left hand vs. right hand Pain-free vs. placebo Groups are related somehow Wife, husband Cancer patient, friend Common Structure of t test Many statistical tests have this form: Statistic/(Standard error of Statistic)....
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This note was uploaded on 05/21/2011 for the course PSY 3204 taught by Professor Brannick during the Spring '10 term at University of South Florida - Tampa.

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11_2_sample_t - The two-sample t-test Expanding t to two...

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