WEBASSIGN ACCESS FOR PROBABILITY & STATS
9th Edition
ISBN: 9780357893111
Author: DEVORE
Publisher: CENGAGE L
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Chapter 12.1, Problem 7E
The article “Some Field Experience in the Use of an Accelerated Method in Estimating 28-Day Strength of Concrete” (J. of Amer. Concrete Institute, 1969: 895) 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? - b. By how much can we expect 28-day strength to change when accelerated strength increases by 1 psi?
- c. Answer part (b) for an increase of 100 psi.
- d. Answer part (b) for a decrease of 100 psi.
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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 =
= 1,750 + 1.5x.
(a) What is the expected value (in pounds per square inch) of 28-day strength when accelerated strength = 2,490 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 50 psi?
psi
(d) By how much can we expect 28-day strength (in pounds per square inch) to change when accelerated strength decreases by 50 psi?
psi
What is a numerical prediction from the regression line equation shown in the photo?
Chapter 12 Solutions
WEBASSIGN ACCESS FOR PROBABILITY & STATS
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