In running the simple linear regression of Y on X, if you know that no observation in your sample has an X value that is equal to 
, what condition might not be true?
A. The residual for the observation closest to 
will be zero.
B. The sum of the residuals equals zero.
C. The average of the residuals equals zero.
D. The regression line's prediction at 
is 
.
Answer: A
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