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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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Example with a Nonsignificant Interaction

The fictitious example presented here is a follow-up to the pilot study described in Chapter 12. The results of that pilot study suggest that scores on a measure of perceived investment significantly increase following a marriage encounter weekend. However (as described earlier), you could argue that those investment scores merely increased as a function of time, and not because of the experimental manipulation. In other words, the investment scores could have increased simply because the couples spent time together and this would have occurred with any activity, not just a marriage encounter experience.

To address concerns about this possible confound (as well as some others inherent in the one-group ...

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