Use the sales data given below to determine

(a) the least squares trend line.

(b) the predicted value for 2002 sales.

(c) theMAD.

(d) the unadjusted forecastingMSE.

Year... Sales(units).......Year........Sales (units)

1995 .......130............ .....1999..............169

1996........140..................2000............. 182

1997........152..................2001............. 194

1998....... 160................. 2002..................?