Case Problem 11.2 - The University Bookstore Computer Purchase Program														
														
	Computers	Linear Trend		Smoothed			Adjusted		3-mo					
Year	Sold	Line	Error	Forecast	Error	Trend	Forecast	Error	MA	Error				
1	518			518										
2	651			518	133.000									
3	708			581.5621662	126.438									
4	921			641.9882008	279.012				625.67	295.33			652.9	268
5	775			775.3310154	-0.331				760.00	15.00			803.1	-28
6	810			775.1728195	34.827				801.33	8.67	715	95.40	805.4	5
7	856			791.817113	64.183				835.33	20.67	773	83.00	821.7	34
8	792			822.4908222	-30.491				813.67	-21.67	814	-22.00	826	-34
9	877			807.9189222	69.081				819.33	57.67	831	46.20	814.8	62
10	693			840.9335308	-147.934				841.67	-148.67	822	-129.00	847.3	-154
11	841			770.2344656	70.766				787.33	53.67	806	35.40	768	73
12	"1,009"			804.0540946	204.946				803.67	205.33	812	197.20	803.8	205
13	902			902.0000021	0.000				847.67	54.33	842	59.60	895.4	7
14	"1,103"			902.0000011	201.000				917.33	185.67	864	238.60	921.9	181
15				998.0601164	-998.060				"1,004.67"		910		1023.9	
					77.269					66.00		67.16		56
alpha=	0.48	MAD =		MAD =	104.770		MAD =		MAD =	96.970		100.7111111		95.59090909
														
		Linear Trend Line:												
		a =												
		b =