a. Construct an A -chart for this process with Two Sigma limits. (Round the final answers to 2 decimal places.) Control Limits b. Is the process in control? O Yes O No UCL LCL

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The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation
equal to 162 minute. The means (in minutes) of 39 samples of n = 6 are:
Sample Mean Sample Mean Sample
1
3.79
14
3.71
27
3.68
28
3.98
3.88
3.73
3.98
3.93
3.93
3.92
2
3
4
5
6
7
8
9
10
11
12
13
3.78
3.91
3.70
3.69
Control Limits
561699382
17
O Yes
O No
20
22
24
3.70
3.81
3.77
3.88
3.80
3.82
3.82
3.70
3.74
3.79
3.70
3.79
b. Is the process in control?
223
UCL
29
30
31
mr
32
33
34
35
36
1399
37
38
a. Construct an
H
-chart for this process with Two Sigma limits. (Round the final answers to 2 decimal places.)
39
Mean
3.83
3.85
3.83
3.59
3.70
3.70
3.59
3.89
3.85
3.89
3.77
3.76
3.69
LCL
Transcribed Image Text:The time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation equal to 162 minute. The means (in minutes) of 39 samples of n = 6 are: Sample Mean Sample Mean Sample 1 3.79 14 3.71 27 3.68 28 3.98 3.88 3.73 3.98 3.93 3.93 3.92 2 3 4 5 6 7 8 9 10 11 12 13 3.78 3.91 3.70 3.69 Control Limits 561699382 17 O Yes O No 20 22 24 3.70 3.81 3.77 3.88 3.80 3.82 3.82 3.70 3.74 3.79 3.70 3.79 b. Is the process in control? 223 UCL 29 30 31 mr 32 33 34 35 36 1399 37 38 a. Construct an H -chart for this process with Two Sigma limits. (Round the final answers to 2 decimal places.) 39 Mean 3.83 3.85 3.83 3.59 3.70 3.70 3.59 3.89 3.85 3.89 3.77 3.76 3.69 LCL
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