The article Some Field Experience in the Use of anAccelerated Method in Estimating
Chapter 12, Problem 7(choose chapter or problem)
The article Some Field Experience in the Use of anAccelerated Method in Estimating 28-Day Strengthof Concrete (J. of Amer. Concrete Institute, 1969:895) considered regressing y 5 28day standard-curedstrength (psi) against x 5 accelerated strength spsid.Suppose the equation of the true regression line isy 5 1800 1 1.3xa. What is the expected value of 28-day strength whenaccelerated strength 5 2500?b. By how much can we expect 28-day strength tochange when accelerated strength increases by 1 psi?c. Answer part (b) for an increase of 100 psi.d. Answer part (b) for a decrease of 100 psi.
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