In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in

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: 0.12, 0.08, 0 13, 0.18, 0.12, 0.08, 0.15. 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 a t 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

Explanation / Answer

Here mean=0.123 and sd=0.03592

t value is 3.143

E=t*sd/sqrt(n)=0.043

CI=0.123+/-E=(0.08,0.166)

B is correct answer

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