The sales data given in Example 19.5 are reproduced below, with the break-up of the yearly sales on a quarterly basis. You are required to

(a) obtain seasonal indices, and

(b) forecast the sales for the years 2009 and 2010 on a quarterly basis

Quarter Year Total 1 III IV 2001 18 27 2002 17 2003 21 2004 21 29 2005 19 2006 22 2007 24 2008 21 22222222 30 26 28 30 32 29 22222222 23 14 82 20 13 80 23 20 90 26 16 92 14 83 26 16 94 24 19 99 29 13 92