11 - post test scores for each group o Baseline variable that differs across the group sampled o RUN AN INDEPENT T-TEST ON THE TWO OUTCOMES OF THE

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3/2/11 Dependent Samples t-test o Independent t-tests are used when groups are unrelated o Dependent samples are used when we are testing the same group on two different times Combining the Two o The dependent test takes into account a “baseline” but focuses on only one group o Independent doesn’t always take a baseline into account but tests for differences between the two groups o What if we wanted to test for differences between drug and therapy treatments while accounting for baseline ptsd levels? Perform an independent test on the differences between pre and
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Unformatted text preview: post test scores for each group. o Baseline- variable that differs across the group sampled o RUN AN INDEPENT T-TEST ON THE TWO OUTCOMES OF THE DEPENDENT SAMPLES • Summary o The dependent samples t-test, or paired samples t-test, tests for differences within one group on two separate occasions or matched (wife and husband/twins) o We count degrees of freedom based on the number of participants not the number of data points We don’t count each test once, just each participant once...
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This note was uploaded on 12/07/2011 for the course PSYC 203 taught by Professor Worthy during the Spring '11 term at Texas A&M.

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