In a sample of 7 cars, each car was tested for nitrogen-oxide emissions. (in grams per mile) and the following results were obtained: 0.11, 0.14, 0.08, 0.18, 0.14, 0.12, 0.14. Assuming that this sample is representatives 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/mi, can we safely conclude that that this requirement is being met?

What is the confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars?

g/ mi < < g/mi

Can we safely conclude that the requirements that nitrogen-oxide emissions be less than 0.165g/mi is being met? (A,B,C, or D).

1. a Yes, we can definitely conclude that the requirement is met for all cars
2. b Yes, because the confidence interval contains 0.165g/mi.
3. c No, it is possible that the requirement is being met, but it is also very possible that the mean is not less than 0.165 g/mi..
4. d No, because the confidence interval does not contain 0.165 g/mi.