Lab $14$ Refer to Activities $182$

Problem:

The owner of a convenience store near Salt Lake City in Ut$$h has been tabulating weekly sales at the store, excluding gas. The accompanying data file contains the sales for $30$ weeks.

Questions:

a$.$ Construct a $3-$period moving average to forecast sales for the ${31}^{st}$ week.

b$.$ Use simple exponential smoothing forecast with $=0\mathrm{.}3$ to forecast sales for the $31$st week.

c$.$ Which is the preferred technique for making the forecast based on calculate MSE, MAD, and MAPE?

Hints: