Examine the Statistical Process Control Outputs Below

Essay

Examine the Statistical Process Control outputs below. Answer the following questions.
a. What is the sample size?
b. What is the number of samples?
c. What is the mean of sample 8; what is the range of sample 10?
d. Is this process in control? Explain-a simple Yes or No is insufficient.
e. What additional steps should the quality assurance team take? $\begin{array}{|l|l|l|l|l|l|l|}\hline&&\text { Mean } && \text { Range }\\\text { UCL (Upper control limit) }&&12.6856&&1.0193\\\hline\text { CL (Center line) }&&12.36&&0.67\\\text { LCL (Lower control limit) }&&10.0344&&0\\\text { Sample Number }&\text { Item 1 }&\text { Item 2 }&\text { Item 3}&\text { Item 4}&\text { Mean } & \text { Range }\\\hline \text { Sample 1 } & 12.2 & 12.6 & 12 & 12.1 & 12.225 & 0.6 \\\text { Sample 2 } & 11.9 & 12.5 & 12.4 & 12.7 & 12.375 & 0.8 \\\text { Sample 3 } & 12 & 12.2 & 12.9 & 13.1 & 12.55 & 1.1 \\\text { Sample 4 } & 12.5 & 12.5 & 12.4 & 12.8 & 12.55 & 0.4 \\\text { Sample 5 } & 12.2 & 12.8 & 12.7 & 12 & 12.425 & 0.8 \\\text { Sample 6 } & 12.1 & 12.5 & 11.8 & 12.3 & 12.175 & 0.7 \\\text { Sample 7 } & 12.3 & 12.4 & 12.8 & 12.4 & 12.475 & 0.5 \\\text { Sample 8 } & 12 & 12.1 & 12.4 & 12.2 & 12.175 & 0.4 \\\text { Sample 9 } & 12.1 & 12.8 & 12.4 & 11.9 & 12.3 & 0.9 \\\text { Sample 10 } & 12.6 & 12.4 & 12.1 & 12.3 & 12.35 & 0.5 \\\hline\end{array}$