The following Table gives data on output per hour (X) and real compensation per hour (Y) for the business and nonfarm business sectors of the U.S. economy. Year 1990 Y= 1 X = 10 1991 Y =3 X= 15 1992 Y= 4 X= 20 Estimate the slope of the OLS regression of Y on X (2) from the following regression: Yi = + 2 Xi + Ui