Testing Group Difierences using T-tests, ANOVA, …

Testing Group Differences using T-tests, ANOVA, and NonparametricMeasuresJamie DeCosterDepartment of PsychologyUniversity of Alabama348 Gordon Palmer HallBox 870348 Tuscaloosa, AL 35487-0348 Phone: (205) 348-4431 Fax: (205) 348-8648 January 11, 2006I would like to thank Anne-Marie Leistico and Angie Maitner for comments made on an earlier version ofthese notes. If you wish to cite the contents of this document, the APA reference for them would beDeCoster, J. (2006). Testing Group Differences using T-tests, ANOVA, and Nonparametric (month, day, and year you downloaded the notes, without the parentheses) from future versions of these notes or help with data analysis RIGHTS TO THIS DOCUMENT ARE RESERVEDC ontents1 Introduction12 Testing One or two Means53 Testing a Single Between-Subjects Factor154 Testing Multiple Between-Subjects Factors305 Testing a Single Within-Subjects Factor476 Testing Multiple Within-Subjects Factors54iChapter Data and Data Sets The information that you collect from an experiment, survey, or archival source is referred to as yourdata.

called the independent variable (IV) while the variable you are trying to predict is called the dependent variable (DV). 1.2 General information about statistical inference † Most of the time that we collect data from a group of subjects, we are interested in making inferences about some larger group of which our subjects were a part. We typically …

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