Question: (8 points) Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Obs.1 15.87 16.20 15.85 15.97 16.40 Obs.2 16.21 16.25 16.00 16.10 16.11 Obs.3

(8 points)

	Sample 1	Sample 2	Sample 3	Sample 4	Sample 5
Obs.1	15.87	16.20	15.85	15.97	16.40
Obs.2	16.21	16.25	16.00	16.10	16.11
Obs.3	16.35	15.93	16.05	16.20	15.90
Obs.4	16.50	15.95	15.95	15.85	15.78

(1) Construct x-bar chart (3 points) and R-chart (3 points) using the data above

(2) Is the production process in quality control? Why? (1 point)

(3) If the quality manager collects a new sample today with the following observation values: 16.50, 16.15, 15.65, 15.45 is the process still in control? Why ?(1 point)

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