Consider the following sales dataset:

Determine the forecast for period $9,$ using the simple average method $($round up your answer in needed$)$:

Determine the forecast for period $10,$ using the simple average method $($round up your answer in needed$)$:

Determine the forecast for period $9,$ using the last period demand method $($na$$ve model$)$:

Determine the forecast for period $9,$ using the moving average method $(n=4)($round up your answer in needed$)$:

Determine the forecast that was made for period $6$ at the end of period $5,$ using the moving average method $(n=4)$

Determine the forecast for period $9,$ using the exponential smoothing method $($alpha $=0\mathrm{.}1)($hint: you will need to calculate all the forecast

values prior to period $9)($round up if needed$)$: