Question: A control chart is often characterized by z where + z specifes the UCL (upper control limit) and - z defines the LCL (lower control

A control chart is often characterized by z where +z specifes the UCL (upper control limit) and -z defines the LCL (lower control limit). Assume has already been adjusted for the specific type of control chart of interest, for example, the sample size. So, no further adjustment of is needed.

(1) What is the value of z, if we would like the region between LCL and UCL to cover 93.42% of the process output? [probability => z value, inside-out]

Z = (Two decimal points)

(2) If we adopt a control chart of 1.72, what is the percentage of process output falling within the range of UCL and LCL? [z value => probability, outside-in]

% (Keep two decimal points. Remember to convert to percentage first.)

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