Use the sales data given below to determine: (a) the least squares trend line, and (b) the predicted value for 2003 sales.

Year ______________________ Sales (Units)

1996 ......................................100

1997 ......................................110

1998 ......................................122

1999 ......................................130

2000 ......................................139

2001 ......................................152

2002 ......................................164

To minimize computations, transform the value of x (time) to simpler numbers. In this case, designate year 1996 as year 1, 1997 as year 2, etc.