The correlation between the age and height of children is found to be about r = 0.7. Suppose we use the age x of a child to predict the height y of the child. We conclude

Question

 

A.	the least-squares regression line of y on x would have a slope of 0.7.
B.	the fraction of variation in heights explained by the least-squares regression line of y on x is 0.49.
C.	about 70% of the time, age will accurately predict height.
D.	height is generally 70% of a child's age