
48 Six Sigma Case Studies with Minitab
®
FIGURE 4.8
Selection of individual value plot.
1110
Ho
987
X
Machine Q
Individual Value Plot of Machine Q
(with Ho and 95% t-confidence interval for the mean)
FIGURE 4.9
Individual value plot.
One-Sample T: Machine Q
Test of mu = 10 vs < 10
95% Upper
Variable N Mean StDev SE Mean Bound T P
Machine Q 20 8.888 0.981 0.219 9.268 -5.07 0.000
FIGURE 4.10
Output of 1-sample t-test.