An article on estimating 28-day strength of concrete considered regressing y = 2

Question

An article on estimating 28-day strength of concrete considered regressing y = 28-day standard-cured strength (psi) against x = accelerated strength (psi). Suppose the equation of the true regression line is y 1850 1.3x. (a) What is the expected value of 28-day strength when accelerated strength-2520? 5126 psi (b) By how much can we expect 28-day strength to change when accelerated strength increases by 1 psi? 1.3 psi (c) By how much can we expect 28-day strength to change when accelerated strength increases by 100 psi? 105 X psi (d) By how much canwe expect 28-day strength to change when accelerated strength decreases by 100 psi? 1720 x psi

Explanation / Answer

c)expected change when accelerated strength increases by 100 psi =1.3*100=130

d)

expected change when accelerated strength decreases by 100 psi =1.3*(-100)=-130

( please revert for any clarification required)

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