Joe Stats is collecting data from pediatric patients who are receiving vaccinations. In analyzing the data, he is running a correlation to evaluate the relationship between pulse rate and anxiety level given that both are measured as continuously scored variables. He gets the following results: r=.36 p=.01 r2 = .13 How much variability in anxiety is explained by pulse rate?
A. 13%
B. 23%
C. 64%
D. 87 %