Moby Molding Company
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) 30
Process Capability Calculations
Six sigma 0.279
4Upper specification
DATA 1 2 3 4 5 6 7 8 9 10 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
10.06 -0.07 -0.01 -0.08 -0.10 -0.03 -0.04 -0.03 -0.03 -0.03 -0.05 -0.06 -0.05 -0.03 -0.04 -0.04 -0.03 -0.04 -0.05 -0.03 0.04 0.03 0.02 0.03 0.05 0.05 -0.02 0.04 0.05 0.01
6
7
8
9
10
Average 0.04 -0.003 0.03 0.01 -0.01 0.015 0.01 0.03 -0 0 0 -0 -0 0.01 0 0.02 0.013 -0 0.03 -0 0.02 0.03 0.02 0.01 0.02 0.02 -0 0.03 0.04 -0 #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 -0.07 -0.067 -0.07 -0.07 -0.07 -0.07 -0.07 -0.1 -0.1 -0.1 -0.07 -0.1 -0.1 -0.1 -0.1 -0.1 -0.067 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.07 -0.07 -0.1 -0.1 -0.07 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1
Center 0.01 0.009 0.01 0.01 0.01 0.009 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.009 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
UCLx-bar 0.09 0.085 0.09 0.09 0.09 0.085 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.085 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09
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
X-bar and s-Chart
Sample size (2 – 10)
Cp
Control Chart Factors
Avg. std. dev. 1.628 0 2.266 2.06
0.08
0.1
Prob. 8-36 X-bar Chart
Averages
Lower control limit
Upper control limit
Center line
0.08
0.1
0.12
Prob. 8-36 s-Chart
Standard Deviations
Lower control limit
Upper control limit
Center line
Run Chart
Moby Molding Co.
Sample Head 1 Head 2 Head 3 Head 4
1 0.06 0.03 0.05 0.03
2 -0.07 -0.01 0.05 0.02
3 -0.01 0.05 0.04 0.03
4 -0.08 0.02 0.03 0.07
20 -0.03 -0.03 -0.03 0.07
21 0.04 0.03 0.06 -0.07
22 0.03 0.07 0.03 -0.01
23 0.02 0.06 0.07 -0.08
24 0.03 0.04 0.07 -0.10
25 0.05 0.00 0.07 -0.03
26 0.05 0.04 0.02 -0.04
27 -0.02 0.02 -0.01 -0.03
28 0.04 0.10 0.00 -0.03
29 0.05 0.11 0.04 -0.03
30 0.01 -0.06 -0.02 -0.03
-0.15
-0.10
0.15
Run Chart for Individual Heads
Head 1 Head 2 Head 3 Head 4
Page 4