Sales of stoves have been going well for the Good- Value Department Store. These sales for the past five months have been 15, 18, 12, 17, 13. Use the following methods to obtain a forecast of sales for the next month.
a. The last-value method.
b. The averaging method.
c. The moving-average method with three months.
d. If you feel that the conditions affecting sales next month will be the same as in the last five months, which of these methods do you prefer for obtaining the forecast? Why?