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1. When studying the relationship between ankle-brachial blood pressure index and peripheral vascular disease the researchers...

1. When studying the relationship between ankle-brachial blood pressure index and peripheral vascular disease the researchers have a significant R square. They then add a second independent variable of a pain scale. The R square in the model that includes both independent variables is significant but the R square change is not. You know this means:

A. The second variable added may not be significant and should be examined further

B. Having both variables in the model explains significantly more variation in peripheral vascular disease

C. The R square change only matters with the first variable

D. Because the model is significant both variables should be included

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