e manager of the Petroco Service Station wants to forecast the demand for unleaded

gasoline next month so that the proper number of gallons can be ordered from the

distributor. The owner has accumulated the following data on demand for unleaded

gasoline from sales during the past $10$ months:

Months Demand

October $800$

November $725$

December $630$

January $500$

February $645$

March $690$

April $730$

May $810$

June $1200$

July $980$

Part $1$

Compute the following:

a$-$ MA$3$

b$-$ MA$4$

c$-$ WMA$3(0\mathrm{.}5,0\mathrm{.}3,0\mathrm{.}2)$

d$-$ Exponential Smoothing forecast $(\backslash$alpha $=0\mathrm{.}3)$

e$-$ Adjusted Exponential Smoothing forecast $(\backslash$alpha $=0\mathrm{.}3,\backslash$beta $=0\mathrm{.}2)$

Part $2$

Using MAD, determine which of these five forecasts is more accurate.