3.9. Reconsider the experiment in Problem 3.7. Find a 95 percent confidence interval on the mean tensile
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3.9. Reconsider the experiment in Problem 3.7. Find a 95 percent confidence interval on the mean tensile strength of the Portland cement produced by each of the four mixing techniques.
Also find a 95 percent confidence interval on the difference in means for techniques 1 and 3. Does this aid you in interpreting the results of the experiment?
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