The data shown in Table 1 (below) are X and R values for 24 samples of size n = 5 taken from a process producing bearings. Set up x and R charts on this process Does the process seem to be in statistical control based only on the control limits?
If necessary, establish revised control limits for phase-2 monitoring:
Table 1: Bearing diameter data
Sample Number 1: 34.0, 35.4
Sample Number 2: 37.1
Sample Number 3: 34.9
Sample Number 4: 33.5
Sample Number 5: 31.7
Sample Number 6: 34.0
Sample Number 7: 35.1
Sample Number 8: 33.7
Sample Number 9: 32.8
Sample Number 10: 33.5
Sample Number 11: 34.2
Sample Number 12: 34.5
Sample Number 13: 34.2
Sample Number 14: 31.6
Sample Number 15: 31.5
Sample Number 16: 35.0
Sample Number 17: 34.1
Sample Number 18: 32.6
Sample Number 19: 33.8
Sample Number 20: 34.8
Sample Number 21: 33.6
Sample Number 22: 31.9
Sample Number 23: 38.6
Sample Number 24: 34.2