Question

Homework: Section 7-3 Homework Save Score: 0 of 1 pt 6 of 19 (11 complete) HW Score: 56%, 14 of 25 pts 7.3.16 Assigned Media Question Help In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained: 0.16, 0.06, 0.19,0.12, 0.06, 0.15, 0.06. 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/mi, can we safely conclude that this requirement is being met? Click here to view at distribution table. Click here to view page 1 of the standard normal distribution table Click here to view page 2 of the standard normal distribution table What is the confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars? g/mi<< g/mi (Round to three decimal places as needed.)

Answer 1

The statistic software output for this problem is:

One sample T confidence interval: : Mean of variable 98% confidence interval results: Variable Sample Mean Std. Err. DF L. Limit U. Limit data 0.11428571 0.02068553 6 0.049277954 0.17929347

The 98% CI is :

0.049 g / mi < $\mu$ < 0.179 g / mi