The number of daily calls for the repair of Speedy copy machines has been recorded as follows.

October	Calls
1	92
2	127
3	106
4	165
5	125
6	111
7	178
8	97

(Round all answers to 1 decimal place.)

a. Prepare three-period moving-average forecasts for the data. What is the error on each day?

b. Prepare three-period weighted-moving-average forecasts using weights of W₁ = 0.5, W₂ = 0.3, W₃ = 0.2. What is the error on each day?

c. Calculate the arithmetic sum of errors and the absolute deviation for both methods.

Which of the two forecasts is better?

multiple choice

3-period Moving Average

Weighted Average

Neither 3-period Moving Average nor Weighted Average