Given the following data, use exponential smoothing $($alpha $=\mathrm{.}37)$ to develop a demand forecast. Assume the forecast for the initial period is $20$

Period $12345678$

Demand $2325171920162224$

a$.$ What is the forecast for the $9$th period

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b$.$ What is the MAD?

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c$.$ If a change occurred and if you are now only evaluating from Period $5$ onward, with Period $5\text{'}$s forecast as $23,$ what is the new forecast for Period $9?$

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$,$ and the MAD?

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