Mathematics, 31.05.2020 00:00 destinyaus14
Some Field Experience in the use of an Accelerated Method in 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 =1800 +1.3x.
a. What is the expected value of 28-day strength when accelerated strength= 2500? (2 marks)
b. By how much can we expect 28-day strength to change when accelerated strength increases by 1 psi? (4 marks)
c. Answer part (b) for an increase of 100 psi. (2 marks)
d. Answer part (b) for a decrease of 100 ps
Answers: 1
represents the accelerated strength in psi, and 
represents 28-day standard-cured strength in psi.
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Some Field Experience in the use of an Accelerated Method in Estimating 28-Day Strength of Concrete"...
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