END-OF-CHAPTER PROBLEMS

6.15)  There are a variety of different charts that can be developed for each of the three examples.  The following is one possibility:



6.16)

a)  The first scatter diagram shows a strong positive relationship:


b)  The second scatter diagram shows an obvious relationship between Defects and Turnover:


c)  The Pareto Chart is:


d)  The following is one possible Ishikawa diagram:



S6.6)


The following is the Mean (X) Chart developed using POM for Windows:

Note that plots 1 through 5 are all above the mean, indicating a cause for inspection or that the process is out of control.

The following is the Range (R) Chart developed using POM for Windows:

Note that plots 17 through 21 are all above the mean, indicating a cause for inspection or that the process is out of control.

Although both of the charts above indicate a cause for inspection, only one would be required to suspect that the process is out of control.


S6.15)

a)  The total number defective is 57


The following is the p-Chart developed using POM for Windows:


b)  The process is out of control for the future days:  the third of the next three days (13 defects) is above the UCL (0.13 > 0.1266).


S6.23)


The following is the c-Chart developed using POM for Windows:

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