Question: 17.52 Constructing and interpreting the s chart. Table 17.11 also gives x and s for each of the 50 samples. a. Make an s chart

17.52 Constructing and interpreting the s chart. Table 17.11 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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