eekly sales of Heartland multi$-$grain bread at the local Organnons Natural Market are provided in the table below. Based on these data, calculate the following.

Week Sales

$1415$

$2389$

$3420$

$4400$

$5410$

$6432$

$7418$

$8421$

$9444$

a$.$ Forecast for the $10$th week using a $4-$week weighted moving average, with the weights of $\mathrm{.}8,\mathrm{.}7,\mathrm{.}4,$ and $\mathrm{.}3(\mathrm{.}8$ applied to the most recent period$)$:

$422\mathrm{.}21$

$.$ What is the MAD?

$11\mathrm{.}24$

b$.$ Forecast for the $12$th week using Trend analysis:

$444\mathrm{.}56$

$.$ What is the MAD?

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c$.$ Using exponential smoothing with an alpha of $\mathrm{.}67,$ and a first period forecast of $413.$ What is the forecast for week $10?$

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$.$ What is the MAD?

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d$.$ Based on the MAD analysis, which forecasting approach should Organnons utilize?

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