The level of nitrogen oxides (NOx) in the exhaust of cars is a major source of a

Question

The level of nitrogen oxides (NOx) in the exhaust of cars is a major source of air pollution, especially in large cities. Government regulations call for NOx emissions to be no higher than 0.3 grams/mile. A company has 25 cars of a particular model in its fleet. The company President wants to know if the average NOx level of these cars differs from the 0.3 g/mi limit. The data for the NOx emissions for the 25 cars is below:

What is the independent and dependent variable and what kind of hypothesis test should be conducted.

Explanation / Answer

Here the independent variable are the cars which are being tested and the dependent variable is the amount of NOx being emitted.

Since the sample size is < 30 (n = 25) and we are test the average emissions from these cars we use the 1 sample t test for the mean.

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