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 = 1,830 + 1.5x. (a) What is the expected value (in pounds per square inch) of 28-day strength when accelerated strength = 2,410 psi? psi (b) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 1 psi? psi (c) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 130 psi? psi (d) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength decreases by 130 psi? psi
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 = 1,830 + 1.5x. (a) What is the expected value (in pounds per square inch) of 28-day strength when accelerated strength = 2,410 psi? psi (b) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 1 psi? psi (c) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 130 psi? psi (d) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength decreases by 130 psi? psi
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Q6 Please answer a,c,d
![**Estimating 28-Day Strength of Concrete**
An article on estimating the 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 \( y = 1,830 + 1.5x \).
(a) What is the expected value (in pounds per square inch) of 28-day strength when accelerated strength = 2,410 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]
(b) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 1 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]
(c) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 130 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]
(d) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength decreases by 130 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbdd9398b-9a89-4097-8d89-380633fcbf86%2F1abd1e30-f9ce-4e41-9c24-470151186a1e%2Fbhnct4l_processed.png&w=3840&q=75)
Transcribed Image Text:**Estimating 28-Day Strength of Concrete**
An article on estimating the 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 \( y = 1,830 + 1.5x \).
(a) What is the expected value (in pounds per square inch) of 28-day strength when accelerated strength = 2,410 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]
(b) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 1 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]
(c) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength increases by 130 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]
(d) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength decreases by 130 psi?
\[ \boxed{\phantom{aaaaa}} \text{ psi} \]
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