Assignment:
1. The following table presents quarterly seasonal indexes for number of new automobiles sold by a car dealership in Halifax, Nova Scotia.
Spring Summer Fall Winter
1.15 0.80 1.10 0.95
a) Comment on the seasonal indexes in relation to automobile sales.
b) From the original historical data (2002-2006) a trend of TRt = 250 + 6t, where t = 1 to 20, was calculated. Assuming a multiplicative seasonal model forecast the number of new automobiles expected to be purchase in the year 2007, by quarter.
Provide complete and step by step solution for the question and show calculations and use formulas.