c$)$ Using the$3-$year weighted moving average with weights $0\mathrm{.}10,0\mathrm{.}30,$ and $0\mathrm{.}60,$ using $0\mathrm{.}60$ for the most recent$$ period, provide the forecast from periods $4$ through $12($round your responses to one decimal$$ place$).$

Year

$4$

$5$

$6$

$7$

$8$

$9$

$10$

$11$

$12$

Forecast

$$

$6\mathrm{.}4$

$$

$7\mathrm{.}8$

$$

$11$

$$

$9\mathrm{.}6$

$$

$10\mathrm{.}9$

$$

$12\mathrm{.}2$

$$

$10\mathrm{.}5$

$$

$10\mathrm{.}6$

$$

$8\mathrm{.}4$

Part $4$

$$d$)$ Mean absolute deviation for the forecast developed using the$3-$year moving average is $2\mathrm{.}33$ and for the$3-$year weighted moving average is $2\mathrm{.}83.$ Based on this$$ information, the better forecast is achieved using the

$$

$3-$year moving average

weighted moving average

approach.