Year Quarter Demand

$($D$)$

MA$4$ MA$2$ estimated

seasonal

relatives

$=$ D$/$MA$2$

New Q$.$R Des.

Sales$=$

D$/$New QR t t

$2$

t$*$y

$2006$ Winter $1400$

Spring $1500$

Summer $1000$

Fall $600$

$2007$ Winter $1200$

Spring $1400$

Summer $2100$

Fall $750$

$2008$ Winter $1000$

Spring $1600$

Summer $2000$

Fall $650$

$2009$ Winter $900$

Spring $1500$

Summer $1900$

Fall $500$