Problem $3-15($Algo$)$

Historical demand for a product is:

DEMAND

January $12$

February $9$

March $13$

April $12$

May $14$

June $13$

a$.$ Using a weighted moving average with weights of $0\mathrm{.}60($June$),0\mathrm{.}30($May$),$ and $0\mathrm{.}10($April$),$ find the July forecast.

Note: Round your answer to $1$ decimal place.

b$.$ Using single exponential smoothing with $\backslash$alpha $=0\mathrm{.}10$ and a June forecast $=11,$ find the July forecast.

Note: Round your answer to $1$ decimal place.

d$.$ Using the regression equation in d$,$ calculate the forecast for July.

Note: Do not round intermediate calculations. Round your answer to $1$ decimal place.