The slope of the least squares prediction equation and the correlation are similar in the sense that

(a) They do not depend on the units of measurement.

(b) They both must fall between −1 and +1.

(c) They both have the same sign.

(d) They both equal 1 when there is the strongest association.

(e) Their squares both have proportional reduction in error interpretations.

(f) They have the same t statistic value for testing H0:

independence.

(g) They both can be strongly affected by severe outliers.