A Foreman Wants to Use An $\overline { \mathrm { X } }$

question 44

Multiple Choice

A foreman wants to use an $\overline { \mathrm { X } }$
Chart to control the average length of the bolts manufactured.He has recently collected the six samples given below. $$\begin{array} { c c c c c } \text { Sample } & & & & \\1 & 1.99 & 2.01 & 2.02 & 2.02 \\2 & 2.00 & 2.00 & 2.01 & 2.01 \\3 & 1.98 & 1.99 & 2.01 & 1.98 \\4 & 2.01 & 2.02 & 2.02 & 1.99 \\5 & 1.99 & 1.99 & 2.01 & 1.99 \\6 & 2.03 & 1.98 & 2.03 & 2.04\end{array}$$
Determine the LCL and the UCL for the $\bar { X }$
Chart.

• A)[1.975,2.035]
• B)[1.915,2.095]
• C)[1.983,2.027]
• D)[1.991,2.019]

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