2.28. A new filtering device is installed in a chemical unit. Before its installation, a random sample

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2.28. A new filtering device is installed in a chemical unit.

Before its installation, a random sample yielded the following information about the percentage of impurity: $ 12.5,

$ 101.17, and n1 $ 8. After installation, a random sample yielded $ 10.2, $ 94.73, n2 $ 9.

(a) Can you conclude that the two variances are equal?

Use = $ 0.05.

(b) Has the filtering device reduced the percentage of impurity significantly? Use ( $ 0.05.

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Design And Analysis Of Experiments

ISBN: 9781118146927

8th Edition

Authors: Douglas C. Montgomery

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Question Posted: Sep 18, 2024 09:01 AM

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2.28. A new filtering device is installed in a chemical unit. Before its installation, a random sample

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Design And Analysis Of Experiments

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