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McCarville & Montgomery

Table 1. The Central Composite Design Ezperimental Settings for the Independent Yariables GDI and GB2, Coded from >1.414 to +1.414

FACTOR	-1.414	-1	0	+ 1	+ 1.414
GB1	003.79	010	025	040	040.21
GB2	003.79	010	025	040	040.21

Table 2. The Results of Each of the Ninę Experimental Runs with Dependent Yariables ppm(Defective) and Gage Losses

Run #	GB1	GB2	GB1	GB2	Defective	Losses
1	-1	-1	010	010	12.8958	107899
2	1	-1	040	010	59.2724	82328.8
3	-1	1	010	040	243.089	85939.8
4	1	1	040	040	1170.92	43897
5	-1.414	0	©03.79	025	400.0872	104093
0	1.414	0	040.21	025	413.008	55290.4
7	0	-1.414	025	003.79	13.0908	102.132
8	0	1.414	025	040.21	875.007	58290.3
9	0	0	025	025	107.034	72895.4

Notice that only one center point is chosen at this time. Since there is no random error in this experiment, any replication would be an exact copy of the initial center point. This will result in a pure error term of zero which in tum will erroneously inflate the F values for the model. However, as shown later, there are disadvantages to not replicating the center point.

These responses were analyzed with the Design-Expert software package, and response surface models were constmcted. For morę information