
86 Six Sigma Case Studies with Minitab
®
FIGURE 6.5
Data showing samples in Minitab
®
worksheet before process improvement.
60.057.555.0
52.550.0
99.9
99
95
90
80
70
60
50
40
30
20
10
5
1
0.1
Mean
StDev
N
AD
P-Value
54.65
1.934
100
0.233
0.794
Normality Te st – Before Process Improvement
Normal
FIGURE 6.4
Normality test result before process improvement.