Construct and plot an x-bar and r-chart

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Question (Quality Control):

Ten samples of size four were taken from a process, and their weights measured.  The sample averages and sample ranges are in the following table.  Construct and plot an X-bar and R-chart using these data.  Is the process in control? 

Sample

1

2

3

4

5

6

7

8

9

10

Mean

20.01

19.98

20.25

19.9

20.35

19.23

20.01

19.98

20.56

19.97

Range

0.45

0.67

0.3

0.3

0.36

0.49

0.53

0.4

0.95

0.79

Reference no: EM13223220

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