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A Step-by-Step Approach to Using SAS® for Univariate & Multivariate Statistics, Second Edition by Edward J. Stepanksi Ph.d., Larry Hatcher, Norm O'Rourke

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The Independent-Samples t Test

Example: A Test of the Investment Model

The use of the independent-samples t test is illustrated by testing a hypothesis that could be derived from the investment model (Rusbult, 1980). As discussed in earlier chapters, the investment model identifies a number of variables that are predicted to affect commitment to romantic relationships (as well as to other types of relationships). Commitment can be defined as the participant’s intention to remain in the relationship and to maintain the relationship. One version of the investment model predicts that commitment will be affected by four variables: rewards; costs; investment size; and alternative value. These variables are briefly defined below:

Rewards:the number ...

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