$1.$ Week Sales

$116$

$218$

$314$

$410$

$520$

$622$

ANSWER

a$.$ Using a $3-$period moving average, forecast the sales for weeks four through six.

b$.$ Use exponential smoothing with a $=\mathrm{.}3$ to forecast sales for weeks four through six.

c$.$ Use linear regression $($time series$)$ to develop a prediction equation that will forecast sales. Then use that prediction equation to get forecasts for weeks four through six.

d$.$ Use MAD to pick the best forecasting method of A through C$.$