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Evaluating Process Capability<br />
Assessing Quality<br />
Conduct<br />
capability<br />
analysis<br />
Now that you know the delivery process is in control, conduct a capability analysis to<br />
determine whether the book delivery process is within specification limits and results<br />
in acceptable delivery times. The target value of the delivery process is 3.33 days.<br />
The upper specification limit (USL) is 6 (an order that is received after 6 days is<br />
considered late); no lower specification limit (LSL) is identified. The distribution is<br />
approximately normal, so you can use a normal capability analysis.<br />
1 Choose Stat ➤<br />
Quality Tools ➤<br />
Capability Analysis<br />
➤ Normal.<br />
2 Under Data are<br />
arranged as, choose<br />
Single column.<br />
Enter Days.<br />
3 In Subgroup size,<br />
enter Date.<br />
4 In Upper spec, type<br />
6.<br />
5 Click Options. In Target (adds Cpm to table), type 3.33.<br />
As with other MINITAB<br />
commands, you can<br />
modify a capability<br />
analysis either by<br />
specifying information in<br />
the main dialog box or by<br />
clicking one of the<br />
subdialog box buttons.<br />
6 Click OK in each dialog<br />
box.<br />
<strong>Meet</strong> MINITAB 4-9
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