The compressive strength of concrete is being tested by a civil engineer who tests 12 specimens and
Question:
(a) Check the assumption that compressive strength is normally distributed. Include a graphical display in your answer.
(b) Construct a 95% two-sided confidence interval on the mean strength.
(c) Construct a 95% lower confidence bound on the mean strength. Compare this bound with the lower bound of the two-sided confidence interval and discuss why they are different.
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Step by Step Answer:
a The data appear to be normally distributed based on examination of the no...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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