In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained: 0.08, 0.06, 0.12, 0.19, 0.15, 0.11, 0.13 . 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 < 0.165 g divided by mi, can we safely conclude that this requirement is being met?