Exercises 8 & 9

Section 4 Process Capability

Lesson S04-06

Text: Section 4 pages 32 & Section 9 page 14 – 15

Duration: 16 minutes

Introduction to Exercises 8 & 9

A Quick Capability Analysis Minitab Tutorial

Exercise 8

For the Bended Rubber data in the previous problem, compute the Pp and Ppk. Note that since the sample standard deviation (s) was provided, the appropriate indices are Pp and Ppk. (Cpk is based on the range estimator for the standard deviation).

Summarized statistics from the data and specification limits follow:

• Average (X-Bar) = 69.67
• Std. Deviation (s) = 1.63
• USL = 75.0
• LSL = 65.0

Note: The data has been shown to follow a normal distribution.

Solution / Discussion of Exercise 8

Exercise 9

For the Bended Rubber data in the previous problem, use MINITAB to estimate the Ppk. Also, verify that the process is stable by constructing Individuals and Moving Range charts.

The data may be found in file, Exercise09.MTW.

Solution / Discussion of Exercise 9