A process (Process #440) is under study to be controlled using control limits and X and R charts. A process that is expected to have a measured mean of 15 units has been sampled 20 times, using 5 samples each time for a total of 100 samples. The values that were measured are given below. In addition, for your convenience, the mean (X) and range (R) of each set of samples is also provided. Samples from process to be controlled Range Sample Number Sample Values Mean (x) (R) 1 18.65 21.45 21.45 22.25 22.65 21.29 14.00 20.65 2 20.85 22.05 22.05 22.45 21.61 1.80 20.65 20.65 21.45 22.25 22.25 21.45 1.60 18.85 19.25 20.65 21.05 21.05 20.17 2.20 20.45 21.25 22.05 22.05 22.25 21.61 1.80 19.45 20.05 20.45 21.25 22.65 20.77 3.20 19.05 20.25 20.85 21.45 22.25 20.77 3.20 18.85 19.05 19.45 19.65 21.65 19.73 2.80 9 19.25 19.45 20.25 20.45 21.25 20.13 2.00 10 18.85 19.05 21.45 21.85 22.25 20.69 3.40 11 19.45 20.25 20.85 21.05 22.05 20.73 2.60 12 19.25 19.45 20.25 22.05 22.25 20.65 3.00 13 18.65 19.65 21.25 21.25 22.25 20.61 3.60 14 18.65 18.85 21.25 22.65 22.65 20.81 14.00 15 18.65 18.85 19.45 20.65 21.45 19.81 2.80 16 19.05 20.85 121.45 22.05 22.65 21.21 3.60 17 23.65 25.05 25.05 25.45 27.45 25.33 3.80 18 18.85 18.85 19.25 20.45 22.25 19.93 3.40 19 19.45 19.85 20.25 21.05 22.45 13.00 120.61 20 21.05 21.25 21.25 22.45 22.45 21.69 1.40 Using the above table of samples the preliminary UCL is calculated as The preliminary LCLR is calculated as 0. After discarding any points that fall outside the control limits the final UCL is calculated as the final LCLR is calculated as 0, and the R control chart mean is calculated as and the preliminary LCL is calculated as We now need to calculate the X charts control limits. The preliminary UCL is calculated as After discarding any outlying samples, and repeating until no samples are outside the limits, the final mean is with a final UCLX of and a final LCL of 3 4 5 6 7 18
A process (Process #440) is under study to be controlled using control limits and X and R charts. A process that is expected to have a measured mean of 15 units has been sampled 20 times, using 5 samples each time for a total of 100 samples. The values that were measured are given below. In addition, for your convenience, the mean (X) and range (R) of each set of samples is also provided. Samples from process to be controlled Range Sample Number Sample Values Mean (x) (R) 1 18.65 21.45 21.45 22.25 22.65 21.29 14.00 20.65 2 20.85 22.05 22.05 22.45 21.61 1.80 20.65 20.65 21.45 22.25 22.25 21.45 1.60 18.85 19.25 20.65 21.05 21.05 20.17 2.20 20.45 21.25 22.05 22.05 22.25 21.61 1.80 19.45 20.05 20.45 21.25 22.65 20.77 3.20 19.05 20.25 20.85 21.45 22.25 20.77 3.20 18.85 19.05 19.45 19.65 21.65 19.73 2.80 9 19.25 19.45 20.25 20.45 21.25 20.13 2.00 10 18.85 19.05 21.45 21.85 22.25 20.69 3.40 11 19.45 20.25 20.85 21.05 22.05 20.73 2.60 12 19.25 19.45 20.25 22.05 22.25 20.65 3.00 13 18.65 19.65 21.25 21.25 22.25 20.61 3.60 14 18.65 18.85 21.25 22.65 22.65 20.81 14.00 15 18.65 18.85 19.45 20.65 21.45 19.81 2.80 16 19.05 20.85 121.45 22.05 22.65 21.21 3.60 17 23.65 25.05 25.05 25.45 27.45 25.33 3.80 18 18.85 18.85 19.25 20.45 22.25 19.93 3.40 19 19.45 19.85 20.25 21.05 22.45 13.00 120.61 20 21.05 21.25 21.25 22.45 22.45 21.69 1.40 Using the above table of samples the preliminary UCL is calculated as The preliminary LCLR is calculated as 0. After discarding any points that fall outside the control limits the final UCL is calculated as the final LCLR is calculated as 0, and the R control chart mean is calculated as and the preliminary LCL is calculated as We now need to calculate the X charts control limits. The preliminary UCL is calculated as After discarding any outlying samples, and repeating until no samples are outside the limits, the final mean is with a final UCLX of and a final LCL of 3 4 5 6 7 18
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A process (Process #440) is under study to be controlled using control limits and X and R charts.
A process that is expected to have a measured mean of 15 units has been sampled 20 times, using 5 samples each time for a total of 100 samples. The values that were measured are given below. In addition, for your convenience, the mean (X) and range
(R) of each set of samples is also provided.
Samples from process to be controlled
Mean
Range
Sample Number
Sample Values
(X)
(R)
11
18.66
21.45
21.45
22.26
22.65
21.29
4.00
20.65
20.85
22.05
22.05
22.45
21.61
1.80
20.65
20.65
21.45
22.25
22.25
21.45
1.60
18.85
19.25
20.65
21.05
21.05
20.17
2.20
20.45
21.25
22.05
22.05
22.25
21.61
1.80
19.45
20.05
20.45
21.25
22.65
20.77
3.20
19.05
20.25
20.85
21.45
22.25
20.77
3.20
18.85
19.05
19.45
19.65
21.65
19.73
2.80
19.25
19.45
20.25
20.45
21.25
20.13
2.00
10
18.86
19.05
21.45
21.85
22.26
20.69
3.40
11
19.45
20.25
20.85
21.05
22.05
20.73
2.60
12
19.25
19.45
20.25
22.06
22.25
20.65
3.00
13
18.65
19.65
21.25
21.25
22.25
20.61
3.60
14
18.65
18.685
21.25
22.65
22.65
20.81
4.00
15
18.65
18.85
19.45
20.65
21.45
19.81
2.80
16
19.05
20.85
21.45
22.05
22.65
21.21
3.60
17
23.65
25.05
25.05
25.45
27.45
125.33
3.80
18
18.85
18.85
19.25
20.45
22.25
19.93
3.40
19
19.45
19.85
121.05
22.45
120.61
3.00
20.25
21.25
20
21.05
21.25
22.45
22.45
21.69
1.40
Using the above table of samples the preliminary UCLA is calculated as
The preliminary LCLR is calculated as 0.
After discarding any points that fall outside the control limits the final UCLA is calculated as
, the final LCLR is calculated as 0, and the R control chart mean is calculated as
and the preliminary LCLX is calculated as
We now need to calculate the X charts control limits. The preliminary UCLX is calculated as
After discarding any outlying samples, and repeating until no samples are outside the limits, the final mean is
with a final UCLX of
and a final LCLX of
2
13
4
5
6
7
8
19
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