A quality control engineer monitors the quality of a cylinder production line.He regularly selects a sample of 5 units and measures the diameters.The specification requires the diameter to be 6 inches plus/minus 0.1 inch.The following is a record of the measurements.Is the production process in control?Please use X bar and R charts to make an assessment.

Sample item 1 item 2 Item 3 item 4 Item 5

1 6.1 6.15 5.35 5.98 5.95

2 6.35 6.02 6.2 6.1 5.7

3 5.85 5.9 6.2 6.12 6.08

4 6 5.8 5.7 6.04 6.17

5 6.15 5.6 6.25 5.99 6.01

6 6.13 6.05 5.89 6 5.87

7 5.88 6.03 5.76 6.13 6

8 6.12 5.45 6.15 6.04 5.91