How much can we expect the strength to change at 28 days (in pounds per square inch) when the accelerated strength is increased by 1 psi? R=   What is the expected value of the resistance at 28 days when the accelerating resistance is 2540? R =

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A: Given regression equation is, y=ax+b Here, a=6.22 and b=21.6 Therefore, y=6.22x+21.6

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