In Simple Linear Regression,the Coefficient of Correlation R and the Least

Multiple Choice

In simple linear regression,the coefficient of correlation r and the least squares estimate $b _ { 1 }$ of the population slope $\beta _ { 1 }$ :

A) must have the same numerical value.
B) must have opposite signs.
C) must have the same sign.
D) may have opposite signs or the same sign.