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Problem 8-33
Constant Hope Hospital
This spreadsheet is designed for up to 50 samples, each of a constant sample size from 2 to 10. Enter data ONLY in yellow-shaded cells.
Enter the number of samples in cell E6 and the sample size in cell E7. Then enter your data in the grid below.
Click on sheet tabs for a display of the control charts (some rescaling may be needed). Specification limits may be entered in cells N7 and N8 for process capability.
Number of samples (<= 50) 25 Process Capability Calculations Six sigma 6.41
4Upper specification
Lower specification
Grand Average A3 B3 B4 d2
Avg. std. dev. 1.63 0 2.27 2.06
DATA 12345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
116.7 13.3 14.0 15.2 15.0 15.9 14.8 14.7 15.4 16.7 14.0 14.4 15.8 15.5 12.7 16.0 14.0 15.1 13.9 15.9 14.2 14.8 16.3 17.4 13.8
8
9
10
Average 15 15.6 14.15 15.05 14.58 15.33 15.35 15.35 15.6 15.13 15.28 14.53 15.23 15 14.53 15.48 14.05 15.05 14.18 15.2 14.88 15 15.25 15.48 14.65 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A
LCLx-bar 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36 13.36
DO NOT MODIFY THIS TABLE
nA2 D3 D4 d2 A3 B3 B4
2 1.880 0.000 3.267 1.128 2.659 0.000 3.267
3 1.023 0.000 2.574 1.693 1.954 0.000 2.568
4 0.729 0.000 2.282 2.059 1.628 0.000 2.266
5 0.577 0.000 2.114 2.326 1.427 0.000 2.089
6 0.483 0.000 2.004 2.534 1.287 0.030 1.970
7 0.419 0.076 1.924 2.704 1.182 0.118 1.882
8 0.373 0.136 1.864 2.847 1.099 0.185 1.815
9 0.337 0.184 1.816 2.970 1.032 0.239 1.761
Cp
Cpu
Cpl
Cpk
Control Chart Factors
X-bar and s-Chart
Sample size (2 – 10)
14.995
1.002
214.7 16.8 15.1 15.0 14.2 14.1 15.6 15.4 14.9 14.3 15.5 14.1 15.3 15.0 17.3 16.1 13.4 16.2 14.8 14.8 15.6 16.0 16.1 13.6 16.1
312.8 17.4 13.0 14.9 13.4 15.0 16.0 16.3 15.2 14.7 15.4 13.9 14.3 15.1 12.4 14.8 14.8 13.3 13.9 13.8 15.1 16.0 14.0 14.9 15.5
415.8 14.9 14.5 15.1 15.7 16.3 15.0 15.0 16.9 14.8 16.2 15.7 15.5 14.4 15.7 15.0 14.0 15.6 14.1 16.3 14.6 13.2 14.6 16.0 13.2
5
6
7
12
16
16.5
17
1357911 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49
Sample number
Prob. 8-33 X-bar Chart
Averages
Lower control limit
Upper control limit
Center line
0
2.5
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49
Sample number
Prob. 8-33 s-Chart Standard Deviations
Lower control limit
Upper control limit
Center line
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