The daily yield for a local chemical plant has averaged 880 tons for the last several years.

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The daily yield for a local chemical plant has averaged 880 tons for the last several years.

The quality control manager would like to know whether this average has changed in recent months. She randomly selects 50 days from the computer database and calculates the average and standard deviation of the n550 yields as x 5871 tons and s521 tons, respectively. Test the appropriate hypothesis using a 5.05.

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Introduction To Probability And Statistics

ISBN: 9780357114469

15th Edition

Authors: William Mendenhall Iii , Robert Beaver , Barbara Beaver

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