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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 μ = 126.5 and the standard deviation is σ = 0.4.

(a)Compute the upper and lower control limits if samples of size 6 are to be used. (Round your answers to two decimal places.)

UCL=

LCL=

Construct the x bar chart for this process.

(b) Consider a sample providing the following data.

126.8 126.2 127.1 126.7 126.4 127.2

Compute the mean for this sample. (Round your answer to two decimal places.)

x bar =

Is the process in control for this sample?

Yes, the process is in control for the sample.

No, the process is out of control for the sample.     

(c)Consider a sample providing the following data.

127.3 126.7 126.6 127.2 127.5 129.0

Compute the mean for this sample. (Round your answer to two decimal places.)

xbar=

Is the process in control for this sample?

Yes, the process is in control for the sample.

No, the process is out of control for the sample.    

math   Statistics-And-Probability   
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Answer #1

a) UCL=126.98

LCL=126.01

b) xbar=126.73

Yes, the process is in control for the sample.

c)xbar=127.38

No, the process is out of control for the sample.    

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