A regression line is used for all of the following except one. Which one is not a valid use of a regression line?
A) to estimate the average value of y at a specified value of x.
B) to predict the value of y for an individual, given that individual's x-value.
C) to estimate the change in y for a one-unit change in x.
D) to determine if a change in x causes a change in y.
Correct Answer:
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