A company has developed a linear trend model to forecast monthly sales. The following data show the actual sales and the "fitted" sales for months 1-12.
Month Sales Predicted Sales
1 200 185
2 260 221
3 210 258
4 340 294
5 450 330
6 230 366
7 300 402
8 500 438
9 360 475
10 600 511
11 460 547
12 700 583
Based on these data, what is the mean square error for the linear trend model?
Group of answer choices
Approximately 7,968
About 99,615
Nearly 18,000