Let x be the size of a house (sq ft) and y be the amount
13.1 Let x be the size of a house (sq ft) and y be the amount of natural gas used (therms) during a specified period. Sup- pose that for a particular community, x and y are related ac- cording to the simple linear regression model with
b = slope of population regression line = .017
a = y intercept of population regression line = -5.0
a. What is the equation of the population regression line?
b. Graph the population regression line by first finding the point on the line corresponding to x = 1000 and then the point corresponding to x = 2000, and drawing a line through these points.
c. What is the mean value of gas usage for houses with 2100 sq ft of space?
d. What is the average change in usage associated with a 1-sq-ft increase in size?
e. What is the average change in usage associated with a 100-sq-ft increase in size?
f. Would you use the model to predict mean usage for
a 500-sq-ft house? Why or why not? (Note: There are no small houses in the community in which this model is valid.)
Mar 29 2016 06:18 PM
Answers
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Posted 10 May 2017 12:05 PM
My Price 7.00
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