Consider the following time series data for Sales.

Period	Sales
1	1360
2	1310
3	1290
4	1350
5	1290
6	1120
7	1190
8	1230
9	1080
10	1120
11	1060
12	940
13	920
14	768
15	670
16	650
17	679
18	678
19	450
20	200

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Step 1 of 3:

What is the R²for a Linear forecasting model? Use four decimal places.

Step 2 of 3:

What is the R²for a Polynomial (Order 2) forecasting model? Use four decimal places.

Step 3 of 3:

Which is the best model based on the R² value?

a. Polynomial order 2

b. Linear