Exercises. 1. The table shows the sales of a particular brand of automatic dishwasher detergent in a store over a period of 7 weeks.

1. The table shows the sales of a particular brand of automatic dishwasher detergent in a store over a period of 7 weeks.

WeekSale

1 22

2 23

3 19

4 16

5 21

6 28

7 19

Use the Holt-Winters procedure, with smoothing constants and to obtain forecasts over the next 5 weeks.

2. The following table shows manufacturing monthly earnings over 12 months.

Month	Earnings	Month	Earnings

Use the Holt-Winters procedure, with smoothing constants and to obtain forecasts for the next 3 months. Graph the data and forecasts.

3. The following table shows percentage profit of a company over a period of 8 years.

Year	Profit margin
	7.6 6.4 6.9 7.9 8.1 7.0 8.2 6.2

Find forecasts for the next three years, using the Holt-Winters procedure, with smoothing constants and . Graph the data and forecasts.

Answers

1. 22.31; 22.50; 22.68; 22.87; 23.06; 2. 449.01; 474.56; 500.12; 3. 7.29; 7.23; 7.17.

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