A textbook publishing company has compiled data on total annual sales of its business textbooks for the preceding eight years:

Year:	1	2	3	4	5	6	7	8
Sales(000):	37.00	43.10	47.60	50.90	55.50	57.50	63.90	67.80

a-1. Select the correct data chart and fit an appropriate model to it.

Chart A	Chart B	Chart C

(Click to select) Chart A Chart B Chart C

a-2. Forecast the preceding eight years, and determine the forecast errors. (Negative answers should be indicated by a minus sign. Do not round intermediate calculations and round your final answer to 2 decimal places.)

Year	Sales(000)	Forecast	Error	Error2
1	37.00
2	43.10
3	47.60
4	50.90
5	55.50
6	57.50
7	63.90
8	67.80

a-3. Construct 2s control limits. (Round the final answer to 2 decimal places.)

2s control limits are

b. Using the model, forecast textbook sales for each of the next five years. (Round the final answers to 1 decimal place.)

Year	Sales(000)	Forecast	Error
9	74.30
10	76.00
11	83.20
12	87.30
13	92.50

c. Suppose actual sales for the next five years turn out as follows:

Year:	9	10	11	12	13
Sales(000):	74.30	76.00	83.20	87.30	92.50

Calculate the forecast errors for years 9 to 13. Is the forecasting process in control? (Click to select) Yes No