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7.25 Fuel economy. Although the Environmental Protection Agency (EPA) establishes the tests to determine the fuel economy of new cars, it often does not perform them. Instead, the test protocols are given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some spot checks each year. Recently, the EPA announced that Hyundai and Kia must lower their fuel economy estimates for many of their models." Here are some city miles per gallon (mpg) values for one of the models the EPA investigated: MILEAGE 28.0 25.7 25.8 28.0 28.5 29.8 26.9 28.3 29.8 27.2 26.7 27.7 30.2 30.4 29.5 28.0 Give a 95% confidence interval for u, the mean city mpg for this model.

7.25 Fuel economy. Although the Environmental Protection Agency (EPA) establishes the tests to determine the fuel economy of new cars, it often does not perform them. Instead, the test protocols are given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some spot checks each year. Recently, the EPA announced that Hyundai and Kia must lower their fuel economy estimates for many of their models." Here are some city miles per gallon (mpg) values for one of the models the EPA investigated: MILEAGE 28.0 25.7 25.8 28.0 28.5 29.8 26.9 28.3 29.8 27.2 26.7 27.7 30.2 30.4 29.5 28.0 Give a 95% confidence interval for u, the mean city mpg for this model.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section: Chapter Questions
Problem 8SGR
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case. 7.25 Fuel economy. Although the Environmental Protection Agency (EPA) establishes the tests to determine the fuel economy of new cars, it often does not perform them. Instead, the test protocols are given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some spot checks each year. Recently, the EPA announced that Hyundai and Kia must lower their fuel economy estimates for many of their models. Here are some city miles per gallon (mpg) values for one of the models the EPA investigated: MILEAGE 28.0 25.7 25.8 28.0 28.5 29.8 30.2 30.4 26.9 28.3 29.8 27.2 26.7 27.7 29.5 28.0 Give a 95% confidence interval for u, the mean city mpg for this model.
Transcribed Image Text:case. 7.25 Fuel economy. Although the Environmental Protection Agency (EPA) establishes the tests to determine the fuel economy of new cars, it often does not perform them. Instead, the test protocols are given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some spot checks each year. Recently, the EPA announced that Hyundai and Kia must lower their fuel economy estimates for many of their models. Here are some city miles per gallon (mpg) values for one of the models the EPA investigated: MILEAGE 28.0 25.7 25.8 28.0 28.5 29.8 30.2 30.4 26.9 28.3 29.8 27.2 26.7 27.7 29.5 28.0 Give a 95% confidence interval for u, the mean city mpg for this model.
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