Posted by **Johnny** on Friday, January 30, 2009 at 11:05pm.

A textbook publisher wants to determine process control charts for the textbook height. The following table shows the first 20 samples of n=4 sample size of the production of the text.

Sample - X Bar - Range

1 - 10.01 - .01

2 - 9.97 - .04

3 - 9.98 - .03

4 - 10.01 - .04

5 - 10.00 - .04

6 - 10.01 - .02

7 - 10.04 - .04

8 - 9.99 - .07

9 - 9.95 - .04

10 - 9.99 - .06

11 - 10.02 - .03

12 - 10.01 - .04

13 - 10.04 - .02

14 - 9.95 - .02

15 - 10.04 - .01

16 - 9.99 - .04

17 - 10.04 - .03

18 - 10.04 - .06

19 - 10.04 - .07

20 - 10.02 - .06

What are the upper and lower control limits for the X bar chart using the data from the samples above?

What are the upper and lower control limits for the R chart using the data from the samples above?

Discuss the charts you have plotted. What conclusions and recommendations do you make from those charts and the data?

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