A Nurse Researcher Studies the Impact of Medication and Exercise

Multiple Choice

A nurse researcher studies the impact of medication and exercise on HgA1C levels and reports that medication and exercise significantly decreases HgA1C levels. The R square associated with the model is 0.83. You know this means:

A) medication and exercise are not significant predictors
B) medication and exercise explain 17% of the variance in HgA1C levels
C) medication and exercise explain 83% of the variance in HgA1C levels
D) including exercise in the model increased the error of the prediction