a.
Explain the assumptions that are needed to construct confidence intervals for the difference in
Check the assumption using normal probability plot.
b.
Obtain a 99% confidence interval on the difference in mean failure stress under the two different test conditions.
c.
Explain whether there is evidence support the claim that the first test conditions yield higher results, on the average, than the second using confidence interval.
d.
Obtain a 95% confidence bound on the ratio of the variances,
e.
Explain whether there is significant difference in the variances of the two different test conditions using the answer in part (d).
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Applied Statistics and Probability for Engineers
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