How accurate was the demand forecast for the first quarter of $2005?$ Summarize your final answers in the table

below.

Notes:

Quarterly sales by part number come from Exhibit $2.$

Quarterly forecasts come from Exhibit $1,$ which provides WEEKLY forecast by quarter for $2005.$ For

PVB$,4120**13=53,560$; for fire valve, $43**13=559.$

Following the logic in the second paragraph on page $4("$Fourth$,$ we disaggregate $..."),$ derive the forecast

by part number $($multiply the family total by "Plan Bill $\%"$ in Exhibits $3$ and $4,$ respectively$),$ then finish the

rest of the table.