You run a regression analysis on a bivariate set of data (n=36). With average x = 38.2 and average y = 63.4, you obtain the regression equation y = -2.504x - 20.316 with a correlation coefficient of r = -0.023. What is the correlation coefficient?
a. Cannot be determined
b. -0.023
c. -0.05
d. -0.1