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 thw information to obtain a three sigma control chart (z=3) for the mean weight. Process standard deviation is 0.27. Use that control chart to answer the question below.

What is the upper control limit?

What is the center line?

What is the lower control limit?

Sample 1 is out of control? T/F

Sample 2 is out of control? T/F

Sample 3 is out of control? T/F

Sample 4 is out of control?

Sample 5 is out of control?

Samolw 6 is out of control?

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