Management at Jagoda Wholesalers, in Calgary, Canada, has used time-series regression based on point-of-sale data to forecast sales for the next 4 quarters. Sales estimates are $100,000, $120,000,

$140,000, and $160,000 for the respective quarters. Seasonal indices for the 4 quarters have been found to be 1.30, .90, .70, and 1.10, respectively.

APPROACH c To compute a seasonalized or adjusted sales forecast, we just multiply each seasonal index by the appropriate trend forecast: