Download presentation
Presentation is loading. Please wait.
Published byCameron Brown Modified over 9 years ago
1
Matched Pairs t Tests SPSS
2
Source of the Data Cognitive-behavioral intervention to reduce African American adolescents' risk for HIV infection Cognitive-behavioral intervention to reduce African American adolescents' risk for HIV infection Group EC was given a standard 2-hour educational program Group BST went through an 8 week behavioral skills training program.
3
The Dependent Variables The log-transformed frequency of condom- protected sexual intercourse Measured before the intervention, at posttest (8 weeks later), 6 weeks after posttest, and 12 weeks after posttest.
4
A Plot of the Means
5
Download the Data http://core.ecu.edu/psyc/wuenschk/SPSS/ MAN_1W2B.sav http://core.ecu.edu/psyc/wuenschk/SPSS/ MAN_1W2B.sav Bring the data into SPSS We want to do two matched pairs t tests One for the EC group One for the BST group
6
Split the File by Group Data, Split File
7
Conduct the Test Analyze, Compare Means, Paired Samples T Test, Pretest versus fu6
10
Obtain Estimates of Cohen’s d Download the.sav and.sps files D-EqN-- Estimate Cohen's d, equal n data (including correlated samples) d-EqN-Doc -- instructions d-EqN-Doc d-EqN-Dat -- necessary data file d-EqN-Dat d-EqN-Run -- syntax file d-EqN-Run
11
Enter Statistics Into.sav File
12
Run the Syntax File
13
Look Back at.sav File
14
Summary Statement, BST Adolescents in the behavioral skills training group (n = 20) engaged in significantly more condom-protected intercourse six weeks after the training (M = 18.80, s = 11.04) than prior to the training (M = 13.45, s = 13.77), t(19) = 2.35, p =.030, d =.43.
15
Summary Statement, EC Adolescents in the educational control group (n = 20) engaged in significantly less condom-protected intercourse at the six week followup (M = 8.60, s = 11.09) than at pretest (M = 19.8, s = 21.87), t(19) = 2.40, p =.027, d =.65.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.