a. Calculate a trend line and forecast sales for 2008. How confident are you of this forecast?
b. Use exponential smoothing with a smoothing factor w=0.7. What is your 2008 forecast? How confident are you of this forecast?
1998 200 2003 302
1999 215 2004 320
2000 237 2005 345
2001 260 2006 360
2002 278 2007 382