Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile), and the following results were obtained. 0.05, 0.11, 0.15, 0.14, 0.13, 0.06, 0.14 O a. Assuming that this sample is representative of cars in use, construct a 95% confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars. <μ< (Round to the nearest thousandth as needed.) b. One agency requires that nitrogen-oxide emissions be less than 0.157 gram/ mile. Someone claims that nitrogen-oxide emissions have a mean equal to 0.157 gram/mile. Does the confidence interval suggest that this claim is not valid? No Yes

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Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile), and the following results were obtained.
0.05, 0.11, 0.15, 0.14, 0.13, 0.06, 0.14 O
a. Assuming that this sample is representative of cars in use, construct a 95% confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars.
<μ<
(Round to the nearest thousandth as needed.)
b. One agency requires that nitrogen-oxide emissions be less than 0.157 gram/ mile. Someone claims that nitrogen-oxide emissions have a mean equal to 0.157 gram/mile. Does the confidence interval suggest
that this claim is not valid?
No
Yes
Transcribed Image Text:Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile), and the following results were obtained. 0.05, 0.11, 0.15, 0.14, 0.13, 0.06, 0.14 O a. Assuming that this sample is representative of cars in use, construct a 95% confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars. <μ< (Round to the nearest thousandth as needed.) b. One agency requires that nitrogen-oxide emissions be less than 0.157 gram/ mile. Someone claims that nitrogen-oxide emissions have a mean equal to 0.157 gram/mile. Does the confidence interval suggest that this claim is not valid? No Yes
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