Calculating forecast based on trend equation

Excel was used to obtain the following quadratic trend equation:

Sales = 100 - 10X + 15X2

The data used was form 1989 through 1998, coded 0 to 9. The forecast for 199 is_________

A. 1,225
B. 980
C. 1,500
D. 1,600

© SolutionLibrary Inc. solutionlibary.com September 28, 2020, 10:22 am 9836dcf9d7 https://solutionlibrary.com/statistics/multivariate-time-series-and-survival-analysis/calculating-forecast-based-on-trend-equation-2nve
Attachments