Question: 17.66 Constructing and interpreting the s chart. Table 17.10 also gives x and s for each of the 50 samples. (a) Make an s chart

17.66 Constructing and interpreting the s chart. Table 17.10 also gives x and s for each of the 50 samples.

(a) Make an s chart and check for points out of control.

(b) If the s-type cause responsible is found and removed, what would be the new control limits for the s chart? Verify that no points s are now out of control.

(c) Use the remaining 46 samples to find the center line and control limits for an x chart. Comment on the control (or lack of control) of x. (Because the distribution of response times is strongly skewed, s is large and the control limits for x are wide. Control charts based on Normal distributions often work poorly when measurements are strongly skewed.)

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