To Obtain the Slope Estimator Using the Least Squares Principle $X$

Short Answer

To obtain the slope estimator using the least squares principle, you divide the a. sample variance of $X$ by the sample variance of $Y$ .
b. sample covariance of $X$ and $Y$ by the sample variance of $Y$ .
c. sample covariance of $X$ and $Y$ by the sample variance of $X$ .
d. sample variance of $X$ by the sample covariance of $X$ and $Y$ .