Hi, would you be able to help me please?

Question:

The following time series shows the sales of a clothing store over a 10-week period.

Sales

Week ($1,000s)

1 15

2 16

3 19

4 18

5 19

6 20

7 19

8 22

9 15

10 21

a. Compute a 4-week moving average for the above time series.

b. Compute the mean square error (MSE) for the 4-week moving average forecast.

c. Use a = 0.3 to compute the exponential smoothing values for the time series.

d. Forecast sales for week 11.

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Fifteen people were asked to indicate their preference for domestic versus imported cars. The following data showed their preferences.

Individual Domestic vs. Imported

1 +

2 +

3 -

4 +

5 +

6 +

7 -

8 +

9 +

10 +

11 +

12 +

13 +

14 +

15 -

With a = 0.05, test for a significant difference in the preferences for cars. A "+" indicates a preference for imported cars.