The following trend line was calculated from quarterly data for 1996

Question

The following trend line was calculated from quarterly data for 1996 - 2000: $\hat { Y }$ = 0.70 + 0.005t,where t = 1 for the first quarter of 1996.The seasonal indexes computed from the trend line for the four quarters of the year 2001 were 0.85,1.05,1.15,and 0.80,respectively.What is the seasonalized forecast for the third quarter of the year 2001?

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The Answer of The following trend line was calculated from quarterly data for 1996 - 2000: $\hat { Y }$ = 0.70 + 0.005t,where t = 1 for the first quarter of 1996.The seasonal indexes computed from the trend line for the four quarters of the year 2001 were 0.85,1.05,1.15,and 0.80,respectively.What is the seasonalized forecast for the third quarter of the year 2001?