0
CEN = 4.273
??“4
??“2
0
2
4
6
8
10
12
14
16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figure 18.8 Mo ing range chart for 2001.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
10 Count values 12 20 18 11 22 15 18 20 22 25 25
mR values 2 8 2 7 11 7 3 2 2 3 0
table 18.3 Count and Mo ing range Values for 2001
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
8 Count values 10 12 14 15 18 12 15 18 22 25 25
mR values 2 2 2 1 3 6 3 3 4 3 0
table 18.4 Count and Mo ing range Values for 2000
250 n Interpreting the CMMI
UCL = 29.532
LCL = 6.801
CEN = 18.167
0
5
10
15
20
25
30
35
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figure 18.11 indi iduals chart for 2001.
UCL = 8.613
LCL = 0.0
CEN = 2.6364
??“2
0
2
4
6
8
10
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figure 18.9 Mo ing range chart for 2000.
UCL = 31.284
LCL = 3.716
CEN = 17.5
0
5
10
15
20
25
30
35
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figure 18.10 indi iduals chart for 2002.
Statistical Process Control n 251
Are these good numbers or bad numbers? The charts will help us decide.
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