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3. (MMC 7.11) 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 arę given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some audits each year. Recently, the EPA announced that Audi and Volkswagen must lower their fuel economy estimates for some models. Here are some city miles per gallon (mpg) values for one of the models the EPA investigated:

3. (MMC 7.11) 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 arę given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some audits each year. Recently, the EPA announced that Audi and Volkswagen must lower their fuel economy estimates for some models. Here are some city miles per gallon (mpg) values for one of the models the EPA investigated:

MATLAB: An Introduction with Applications
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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Omit a. Having trouble with part b and c.
3. (MMC 7.11) 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 arę given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some audits each year. Recently, the EPA announced that Audi and Volkswagen must lower their fuel economy estimates for some models. Here are some city miles per gallon (mpg) values for one of the models the EPA investigated: 18.0 15.7 15.8 18.0 18.5 19.8 20.2 20.4 16.9 18.3 19.8 17.2 16.7 17.7 19.5 18.0 In Stata, open the Data Editor (command: edit) and enter the above data. b. The vehicle sticker information for this model stated a city average of 19 mpg. Are these mpg values consistent with the vehicle sticker? Perform a significance test using the 0.05 significance level. Be sure to specify the hypotheses, the test statistic, the p-value, and your conclusion. c. Give a 95% confidence interval for the mean city mpg for this model. a.
Transcribed Image Text:3. (MMC 7.11) 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 arę given to the car companies, and the companies perform the tests themselves. To keep the industry honest, the EPA runs some audits each year. Recently, the EPA announced that Audi and Volkswagen must lower their fuel economy estimates for some models. Here are some city miles per gallon (mpg) values for one of the models the EPA investigated: 18.0 15.7 15.8 18.0 18.5 19.8 20.2 20.4 16.9 18.3 19.8 17.2 16.7 17.7 19.5 18.0 In Stata, open the Data Editor (command: edit) and enter the above data. b. The vehicle sticker information for this model stated a city average of 19 mpg. Are these mpg values consistent with the vehicle sticker? Perform a significance test using the 0.05 significance level. Be sure to specify the hypotheses, the test statistic, the p-value, and your conclusion. c. Give a 95% confidence interval for the mean city mpg for this model. a.
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