A company is experimenting with synthetic fibers as a substitute for natural fibers. The quality characteristic of
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(a) Can you conclude that the variances of the breaking strengths of natural and synthetic fibers are different? Use a level of significance a of 0.05. What assumptions are necessary to perform this test?
(b) Based on the conclusions in part (a), test to determine if the mean breaking strength for synthetic fibers exceeds that for natural fibers. Use a significance level a of 0.10.
(c) Find a two-sided 95% confidence interval for the ratio of the variances of the breaking strengths of natural and synthetic fibers.
(d) Find a two-sided 90% confidence interval for the difference in the mean breaking strength for synthetic and natural fibers.
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Related Book For
Fundamentals of quality control and improvement
ISBN: 978-0470226537
3rd edition
Authors: amitava mitra
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