A paper in Quality Engineering [2013, Vol. 25(1)] presented data on cycles to failure of solder joints
Question:
(a) Test the null hypothesis at α = 0.05 that the cycles to failure are the same at both temperatures. Is the alternative one or two sided?
(b) Find a 95% confidence interval for the difference in the mean cycles to failure 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 part cycles to failure indicate any violations of the assumptions for the tests and confidence interval that you performed?
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a 1 The parameter of interest is the difference in mean cycles to failure 1 2 with 0 0 2 H 0 1 2 ...View the full answer
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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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