The breaking strength of a fiber is required to be at least, Operation Management

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The breaking strength of a fiber is required to be at least

Six Sigma;

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 sigma = 3 psi. A random sample of four specimens is tested. 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 α= 0.05 . What are your conclusions?

c. Construct a 95 percent confidence interval on the mean breaking strength.

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