Question: 4 The table below gives the average width (mm) for each of 20 samples of five panels. Also given is the range (mm) of each

4 The table below gives the average width (mm) for each of 20 samples of five panels. Also given is the range (mm) of each sample.

Sample number Mean Range Sample number Mean Range 1 550.8 4.2 11 553.1 3.8 2 552.7 4.2 12 551.7 3.1 3 553.9 6.7 13 561.2 3.5 4 555.8 4.7 14 554.2 3.4 5 553.8 3.2 15 552.3 5.8 6 547.5 5.8 16 552.9 1.6 7 550.9 0.7 17 562.9 2.7 8 552.0 5.9 18 559.4 5.4 9 553.7 9.5 19 555.8 1.7 10 557.3 1.9 20 547.6 6.7 Design cumulative sum (cusum) charts to control the process. Explain the differences between these charts and Shewhart charts for means and ranges.

(see also Chapter 6, Discussion question 10)

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