• February 3rd, 2017

“Some Field Experience .

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The article “Some Field Experience in the Use of an Accelerated Method in Estimating 28-Day Strengthof Concrete” (J. Amer. Concrete Institute, 1969: 895) considered regressingy= 28-day standard-curedstrength (psi) againstx= accelerated strength (psi). Suppose the equation of the true regression line isy= 1800 + 1.3xand that the standard deviation of the random deviation±is 350 psi.
(a) What is the expected value of 28-day strength when accelerated strength is 2000?
(b) By how much can we expect 28-day strength to change when accelerated strength increases by 1 psi?
(c) By how much can we expect 28-day strength to change when accelerated strength decreases by 2 psi?
(d) What is the probability that the observed value of 28-day strength will exceed 5000 psi when the valueof accelerated strength is 2000?

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