The article “Some Field Experience in the Use of an Accelerated Method in Estimating 28-Day Strength of Concrete” (J. of Amer. Concrete Institute, 1969: 895) considx ered regressing y = 28-day standard-cured strength (psi) against x = accelerated strength (psi). Suppose the equation of the true regression line is y = 1800 1 1.3x .
a. What is the expected value of 28-day strength when accelerated strength= 2500 ?
b. By how much can we expect 28-day strength to change 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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