Refer to Exercise 13.9. a About how many specimens per concrete mix should be prepared
Chapter 13, Problem 13.58(choose chapter or problem)
Refer to Exercise 13.9. a About how many specimens per concrete mix should be prepared to allow estimation of the difference in mean strengths for a preselected pair of specimen types to within .02 ton per square inch? Assume knowledge of the data given in Exercise 13.9. b What is the total number of observations required in the entire experiment?
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