19. Time-series forecasting may be used to predict future values of a variable by:

a. A simple moving average c. Exponential smoothing

b. A weighted moving average d. All of the above

20. Given the following data :

Period: 1 # sold: 66

2 76

3 62

4 70

5 60

6 72

7 68

8 78

The estimate of the number sold for the 9^th period using

a simple moving average and k = 4 is:

1. 73.00 c. 78
2. 69.50 d. 71.92

21. Excels Solver is used in a time-series weighted moving average problem to:

a. Predict estimates for more than one period into the future c. Maximize the MSE

b. Minimize the mean square error (MSE) d. None of the above

22. Regarding regression analysis involving only one independent variable:

a. The best method for solving is a visual fit of a line to the data;

b. The best method for solving requires a hyperplane fit to the data.

c. The least squares method is mathematically the best way to apply it;

d. The dependent variable is used to predict the value of the independent variable.