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