Question: A quality inspector took six samples, each with twenty observations, of the weight of a bagging process, in pounds. The sample means and ranges are

A quality inspector took six samples, each with twenty observations, of the weight of a bagging process, in pounds. The sample means and ranges are shown below.

Sample	Mean	Range
1	3.55	0.55
2	3.80	0.75
3	3.50	0.55
4	3.60	0.51
5	3.50	0.55
6	3.55	0.65

Use this information to obtain a three-sigma R-chart for the dispersion of the weight. Use that control chart to answer the questions below.

Do not round intermediate calculations. Round your final answers to three decimal points.

1) What is the upper control limit?

2) What is the center line?

3) What is the lower control limit?

4) Sample 1 is out of control. T or F?

5) Sample 2 is out of control. T or F?

6) Sample 3 is out of control. T or F?

7) Sample 4 is out of control. T or F?

8) Sample 5 is out of control. T or F?

9) Sample 6 is out of control. T or F?

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