Assume a least-squares regression line is found to be y = -5.73 + 0.282x.The coefficient of determination for these data is 0.64.What is the correlation coefficient?
A) 0.411
B) -0.64
C) 0.80
D) -0.80

Question

Quizplus · Accepted Answer

The coefficient of determination (r-squared) is equal to the square of the correlation coefficient (r), so:

r-squared = 0.64
r = sqrt(0.64) = 0.8

Therefore, the correlation coefficient is 0.8, which corresponds to choice C.

Assume a Least-Squares Regression Line Is Found to Be Y