Sales of vegetable dehydrators at Bud$$ Banis's discount department store in Gander over the past year are shown below. Management prepared a forecast using a combination of exponential smoothing and its collective judgment for the $4$ months$$ March, April,$$ May, and$$ June:

Month

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Unit Sales

$100$

$93$

$96$

$108$

$120$

$118$

$92$

$83$

$102$

$98$

$88$

$108$

$$Management$\text{'}$s Forecast

minus

minus

minus

minus

minus

minus

minus

minus

$125$

$114$

$108$

$112$

Part $2$

$$a$)$ Compute MAD and MAPE for$$ management's technique.

MAD for the forecast developed by$$ management's techniqueequals

$$

enter your response here sales $($round your response to two decimal$$ places$)$

Part $3$

MAPE for the forecast developed by$$ management's techniqueequals

$$

enter your response here$\%($round your response to two decimal$$ places$)$

Part $4$

$$b$)$ Do$$ management's results outperform$($i$.$e$.,$ have smaller MAD and MAPE$$ than$)$ a naive$$ forecast?

Using the naive$$ approach, the forecast for period March through June is $($enter your responses as whole $$numbers$)$:

Month

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

May

Jun

Unit Sales

$100$

$93$

$96$

$108$

$120$

$118$

$92$

$83$

$102$

$98$

$88$

$108$

Naive Forecast

minus

minus

minus

minus

minus

minus

minus

minus

$$

enter your response here

$$

enter your response here

$$

enter your response here

$$

enter your response here

Part $5$

MAD for the naive forecastequals

$$

enter your response here sales $($round your response to two decimal$$ places$)$

Part $6$

MAPE for the forecast developed by the naive approachequals

$$

enter your response here$\%($round your response to two decimal$$ places$)$

Part $7$

$$c$)$ Which forecast do you$$ recommend, based on lower forecast$$ error?

When comparing MAD for the two$$ approaches, the better forecast is achieved using the

$$

managerial judgement

naive approach

$.$

Part $8$

When comparing MAPE for the two$$ approaches, the better forecast is achieved using the

$$

naive approach

managerial judgement

$.$