The breaking strength of a fiber is required to be at least 150 psi Past experience has indicated that the standard deviation of breaking strength is 3 psi A random sample of four specimens is tested, and the results are y 1 145, y 2 153, y 3 150, and y 4 , 147 (a) State the hypotheses that you thi...

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The breaking strength of a fiber is required to be at least 150 psi. Past experience has

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The breaking strength of a fiber is required to be at least 150 psi. Past experience has indicated that the standard deviation of breaking strength is σ = 3 psi.

A random sample of four specimens is tested, and the results are y₁ = 145, y₂ = 153, y₃ = 150, and y₄, = 147.

(a) State the hypotheses that you think should be tested in this experiment.

(b) Test these hypotheses using a = 0.05. What are your conclusions?

(d) Construct a 95 percent confidence interval on the mean breaking strength.

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Design And Analysis Of Experiments

ISBN: 9780471316497

5th Edition

Authors: Douglas C., Montgomery

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Question Posted: Sep 24, 2020 06:31 AM

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