Twenty-five samples of size 4 were taken from a production process. The sample means are listed in
Question:
a. Find the centerline and control limits for the x chart.
b. Is the process under control? Explain.
Transcribed Image Text:
9.3 17.1 8.8 12.6 17.6 20.5 14.5 10.3 17.0 5.3 16.3 10.5 11.5 9.4 13.2 5.5 10.5 16.3 21.1 8.7 9.4 11.4 9.4 21.1 16.3 18.5 20.9
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