1. (6 points)

Sample 1	Sample 2	Sample 3	Sample 4
Obs.1	16.4	15.97	15.91	16.2
Obs.2	16.11	16.1	16	16.21
Obs.3	15.9	16.2	16.04	15.93
Obs.4	15.78	15.81	15.92	15.95
Obs.5	15.87	16.21	16.34	16.43

1) Construct x-bar chart ( 2 points ) and R-chart (2 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: 15.45, 15.50, 15.15, 15.92, 15.45 is the process still in control? (1 point)