70. The least squares property of the mean states that the data fall closer to than to any other real number

c. in the sense that the sum of squares of deviations of the data about their mean is smaller than the sum of squares of their deviations about

c. That is, - 197 < - 0 If you have studied calculus, prove this property by treating f

(c) = Lion of c and deriving the value of c that provides a minimum (Hint of f

(c) with respect to c and set it equal to zero.) (-) as a func- Take the denvative