7.26 Testing the sticker information. Refer to the previous exercise. The vehicle sticker information for this model stated a city average of 30 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, SPEE and your conclusion. In MILEAGE

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I need help with 7.26. It say to refer to the to the previous exercise, which is 7.25, so I posted that on too. For 7.25 my answer is 2.1314, just in case you need that for 7.26.

7.26 Testing the sticker information. Refer to the
previous exercise. The vehicle sticker information for this
model stated a city average of 30 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.
MILEAGE
Transcribed Image Text:7.26 Testing the sticker information. Refer to the previous exercise. The vehicle sticker information for this model stated a city average of 30 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. MILEAGE
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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