create a simple exponential smoothing

forecasting model to answer questions on the final exam. Assume alpha$=0\mathrm{.}2$

Thousands of Thousands of

Sales $($$$1000)$ Radio&TV ads Newspaper ads

$$1,119\mathrm{.}00040$

$$973\mathrm{.}00040$

$$875\mathrm{.}002525$

$$625\mathrm{.}002525$

$$910\mathrm{.}003030$

$$971\mathrm{.}003030$

$$931\mathrm{.}003535$

$$1,177\mathrm{.}003535$

$$882\mathrm{.}004025$

$$982\mathrm{.}004025$

$$1,628\mathrm{.}004545$

$$1,577\mathrm{.}004545$

$$1,044\mathrm{.}005050$

$$914\mathrm{.}005050$

$$1,329\mathrm{.}005520$

$$1,330\mathrm{.}005520$

$$1,405\mathrm{.}006030$

$$1,436\mathrm{.}006030$

$$1,521\mathrm{.}006535$

$$1,741\mathrm{.}006535$

$$1,866\mathrm{.}007040$

$$1,717\mathrm{.}007040$