Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile),
Question:
Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile), and the following results were obtained: 0.06, 0.11, 0.16, 0.15, 0.14, 0.08, 0.15 (based on data from the Environmental Protection Agency).
Use the i distribution to construct the confidence interval estimate of the population mean.
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.
b. The Environmental Protection Agency requires that nitrogen-oxide emissions be less than 0.165 gram/mile. Someone claims that nitrogen-oxide emissions have a mean equal to 0.165 gram/mile. Does the confidence interval suggest that this claim is not valid? Why or why not?
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Statistical Reasoning for Everyday Life
ISBN: 978-0321817624
4th edition
Authors: Jeff Bennett, Bill Briggs, Mario F. Triola