Question
Temperature is used to measure the output of a production process. When the process is in...
Temperature is used to measure the output of a production process. When the process is in control, the mean of the process is 121.4 and the standard deviation is .3.
a. Construct an chart for this process if samples of size 6 are to be used (to 2 decimals).
b. Is the process in control for a sample providing the following data?
| 128.9 | 128.7 | 128.9 | 128.9 | 129 | 129.1 |
(to 2 decimals)
Conclude that the process - Select your answer -is notisItem 4 in control.
c. Is the process in control for the following data?
| 128.7 | 129.1 | 128.8 | 129.4 | 129.3 | 128.4 |
(to 2 decimals)
Conclude that the process - Select your answer -is notisItem 6 in control.
Homework Answers
Answer #1
a)
UCL = 121.77
LCL = 121.03
b)
| 128.9 | 128.7 | |
| 128.7 | 129.1 | |
| 128.9 | 128.8 | |
| 128.9 | 129.4 | |
| 129 | 129.3 | |
| 129.1 | 128.4 | |
| Mean | 128.9166667 | 128.95 |
Mean (X bar) = 128.92
it is not in between UCL and LCL so not in control
c)
mean (X bar) = 128.95
it is not in between UCL and LCL so not in control
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