A sample of seven cars each car tested in grams per mile with the following results:
0.8, 0.18, 0.12, 0.14, 0.09, 0.18, 0.05
Assume 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 emissions be less than 0.165g/mi can we safely conclude that this requirement is being met?