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):	37.10	45.00	49.80	51.00	54.60	57.60	63.40	68.80

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	37.10
2	45.00
3	49.80
4	51.00
5	54.60
6	57.60
7	63.40
8	68.80

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	74.90
10	78.60
11	82.40
12	88.90
13	92.00

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

Year:	9	10	11	12	13
Sales(000):	74.90	78.60	82.40	88.90	92.00

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