Twenty-five samples of size 4 were taken from a production process. The sample means are listed in

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Twenty-five samples of size 4 were taken from a production process. The sample means are listed in chronological order below. The mean of the sample means and the pooled standard deviation are xÌ… = 13.3 and S = 3.8, respectively.

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.

a. Find the centerline and control limits for the x chart.

b. Is the process under control? Explain.

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Statistics For Management And Economics

ISBN: 9781337093453

11th Edition

Authors: Gerald Keller

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Question Posted: Jun 11, 2018 01:34 AM

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Twenty-five samples of size 4 were taken from a production process. The sample means are listed in

Question:

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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a Centerline x 133 Lower control l...View the full answer

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