3) For the data below: Year Automobile Sales Year Automobile Sales 1990 116 1977 119 1991 105 1998 34 1992 29 1999 34 1993 59 2000 48 1994 108 2001 53 1995 94 2002 65 1996 27 2003 111 (a) Determine the least squares regression line. (b) Determine the predicted value for 2004. (c) Determine the MAD. (d) Determine the unadjusted forecasting MSE