SP_08_Variables_T-tests__ANOVA

# What would you have to do to table 3 how many paired

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Unformatted text preview: 1 vs. group 2 at Pretest, postest1, posttest2 Group 1: Pretest posttest1, Posttest1 posttest 2 Pretest posttest 2 Group 1: Pretest posttest1, Posttest1 posttest 2 Pretest posttest 2 80 75 70 65 60 55 50 45 40 35 30 Pretest Posttest1 Posttest2 Comparison Program Scenario #2 Add more groups 80 75 70 65 60 55 50 45 40 35 30 Pretest Posttest Comparison Program #1 Program#2 Scenario #2 What kind of design is this? What would you have to do to Table 3 How many paired t-tests? How many independent samples t-tests? 80 75 70 65 60 55 50 45 40 35 30 Pretest Posttest Comparison Program #1 Program#2 Scenario #2 What kind of design is this? What would you have to do to Table 3 How many paired t-tests = 3 Group 1: pre- post Group 2: pre-post Group 3: pre-post How many independent samples t-tests? = 6 Pretest: group1 vs. group 2, group 2 vs. group 3, group1 vs. group 3 Posttest: group1 vs. group 2, group 2 vs. group 3, group1 vs. group 3 Now: Think about what happens if you have Why we've been asking for simpler More than 1 DV 3 or more groups, 3 or more measurement occasions Same logic applies, just more complicated designs! Why ANOVA exists! Brief Review and Clarifications Correlation Pvalue vs. rvalue Pvalue is related to confidence in ability to reject the null hypothesis Low pvalue (p < .05) Reject the null hypothesis; Accept the alternative Less than a 5% chance that the result is a chance occurrence High pvalue (p >.05) Fail to reject the null hypothesis; Reject the alternative Pvalue vs. rvalue rvalue is related to the relationship between two continuous variables Positive rvalue Positive relationship If the value for one is high/low, the value for the other is also high/low Negative rvalue Negative relationship If the value of one is high/low, the value for the other is the opposite or the inverse. Statistics Cheat Sheet...
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## This note was uploaded on 08/26/2009 for the course BB H 310W taught by Professor Saltsman,brian during the Spring '07 term at Pennsylvania State University, University Park.

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