# Question

Suppose that you correlate AGE with SBP (systolic blood pressure) and find a strong positive correlation. Next you compute a first order partial correlation between AGE and SBP controlling for WEIGHT (body weight).
a. what would you conclude if this partial r were almost exactly zero?
b. What would you conclude if this partial r were a little smaller than the zero order r between AGE and SBP, but still substantially larger than zero?
c. What would you conclude if the zero order r and the partial r for these variables were essentially identical?

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• CreatedNovember 20, 2015
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