Weekly sales of Ten-Grain Bread at the local organic food market are in the table below. Week Sales

1 415

2 389

3 420

4 382

5 410

6 432

7 405

8 421 Required:

1. Plot the weekly sales data of Ten-Grain Bread. (20 marks)

2. Forecast the week 9 sales using each of the following:

a. Naive method. (10 marks)

b. A five-week moving average. (20 marks)

c. A four-week weighted average using 0.1, 0.2, 0.3, 0.4, with the heaviest weights applied to the most recent months. (25 marks)

d. Compute the forecast for the week 9 using exponential smoothing with a forecast for week 5 of 410 and =0.2=0.2. (25 marks)