An article in Polymer Degradation and Stability (2006, Vol. 91) presented data from a nine-year aging study
Question:
(a) Is there evidence to support the claim that mean compression increases with the temperature at the storage condition?
(b) Find a 95% confidence interval for the difference in the mean compression for the two temperatures.
(c) Is the value zero contained in the 95% confidence interval? Explain the connection with the conclusion you reached in part (a).
(d) Do normal probability plots of compression indicate any violations of the assumptions for the tests and confidence interval that you performed?
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Related Book For
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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