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Control charts for the outer diameter

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Question: Control charts for the outer diameter. A sample of 4 skateboard bearings is taken near the end of each hour of production. Table gives x and s for the first 21 samples, coded in units of 0.001 mm from the center of the specifications. The specifications allow a range of ±0.015 mm about the center (a range of -15 to +15 as coded).

1847_Chart.png

(a) Make an s chart based on past data and comment on control of short-term process variation.

(b) Because the data are coded about the center of the specs, we have a given target μ = 0 (as coded) for the process mean. Make an x chart and comment on control of long-term process variation. What special x¯-type cause probably explains the lack of control of x¯?

Reference no: EM131749497

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