The correlation between age and height of children is found to be about r=0.7. Suppose we use age x of a child to predict the height y of a child.
We conlude;
a) least squares regression line of y on x would have a slope of 0.7.
b) fraction of variation in heights explained by least squares regression line of y on x is 0.49.
c) about 70% of the time age will accurately predit height
d) height is generally 70% of a child age.