10.19 The pH of water coming out of a certain filtration plant is specified to be 7.0....

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10.19 The pH of water coming out of a certain filtration plant is specified to be 7.0. Thirty water samples independently selected from this plant show a mean pH of 6.8 and a standard deviation of 0.9.

Is there any reason to doubt that the plant’s specification is being maintained? Use . Find the p-value for this test.

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Probability And Statistics For Engineers

ISBN: 9781133006909

5th Edition

Authors: Richard L Scheaffer, Madhuri Mulekar, James T McClave, Cecie Starr

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