An analyst wants to estimate the linear trend in the GDP growth rate in Elantica over time. He uses the monthly observations of the GDP growth rate (expressed as annual percentage rates) over the period from January 1991 to December 2010 and obtains the following regression results:
There are 240 observations (given)
The question is regarding to the predicted value of July 2012
I used the regression equation with t being 271. The answer is showing them using t as 259 (which I thought would have been July 2011). Am I wrong or is Wiley wrong?