The compressive strength of concrete is being tested by a civil engineer. He tests 12 specimens and
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Question:
The compressive strength of concrete is being tested by a civil engineer. He tests 12 specimens and obtains the following data.
2236 2247 2249 2304
2235 2301 2281 2263
2318 2255 2275 2295
(a) Check the assumption that compressive strength is normally distributed. Include a graphical display in your answer.
(b) Construct a 98% two-sided confidence interval on the mean strength.
(c) Construct a 98% lower-confidence bound on the mean strength.
Related Book For
Applied Statistics and Probability for Engineers
ISBN: 978-1118539712
6th edition
Authors: Douglas C. Montgomery, George C. Runger
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