Question

In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained: 0.17, 0.13, 0.09, 0.18 ,0.06, 0.14, 0.09 . Assuming that this sample is representative of the cars in use, construct a 98% confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars. If the EPA requires that nitrogen-oxide emissions be less than 0.165 g divided by mi, can we safely conclude that this requirement is being met

Answer #1

Each car in a sample of seven cars was tested for
nitrogen-oxide emissions (in grams per mile), and the following
results were obtained. 0.08, 0.11, 0.16, 0.13, 0.12, 0.08,
0.13 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.

Each car in a sample of seven cars was tested for
nitrogen-oxide emissions (in grams per mile), and the following
results were obtained.
0.050.05,
0.110.11,
0.170.17,
0.150.15,
0.140.14,
0.070.07,
0.150.15
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.
(Round to the nearest thousandth as needed.)

In a random sample of ten cars, each car was tested for
nitrogen- oxide emissions (in grams per mile) and the results are
listed below.
0.06, 0.11, 0.16, 0.15,
0.14, 0.08, 0.15, 0.12, 0.09, 0.1
a. Construct a 95% confidence interval for the mean amount of
nitrogen-oxide emissions in all cars.
b. Interpret your confidence interval in context of the
problem.

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