The numbers of copies of a college textbook sold quarterly over the past four years are: Since the time series has trend and seasonal pattern, to forecast the quarterly sales of the textbook, the following regression equation was found: yt= 2120 - 620 Qtr1t - 1320Qtr2t+290Qtr3t + 24t

where Qtr1t , Qtr2t and Qtr3t are dummy variables corresponding to Quarters 1, 2 and 3, and t = time period.

The sales forecast for Quarter 4 of the next year is:

a. 2600
b. 1232
c. 2006
d. 1874

The sales forecast for Quarter 1 of the next year is

a. 1908
b. 1432
c. 2206
d. 1874

1. alwaysrain irrigation, inc. would like to determine capacity requirements for the next four years. currently, two production lines are in place for making bronze and plastic sprinklers. three types of sprinklers are available in both bronze and plastic: 90-degree nozzle sprinklers, 180-degree nozzle sprinklers, and 360-degree nozzle sprinklers. management has forecast demand for the next four years as follows: both production lines can produce all the different types of nozzles. the bronze machines needed for the bronze sprinklers require two operators and can produce up to 12,000 sprinklers. the plastic injection molding machine needed for the plastic sprinklers requires four operators and can produce up to 200,000 sprinklers. three bronze machines and only one injection molding machine are available. what are the capacity requirements for the next four years? (assume that there is no learning.)