To test the mileage efficiency of three new car models,random samples of various sample sizes were selected from each of the three cars and the mpg data obtained are shown below. Based on the sample date,one can conclude that
A)all three car models have the same mean mpg.
B)at least two car models have different mpgs.
C)Model C has a higher mpg than Model A.
D)None of the above.

Question

To test the mileage efficiency of three new car models,random samples of various sample sizes were selected from each of the three cars and the mpg data obtained are shown below.  Based on the sample date,one can conclude that
A)all three car models have the same mean mpg. 
B)at least two car models have different mpgs. 
C)Model C has a higher mpg than Model A. 
D)None of the above.

Quizplus · Accepted Answer

To determine if all three car models have the same mean mpg, we would need to conduct a formal statistical hypothesis test. We cannot conclude that Model C has a higher mpg than Model A based on the given sample data. However, since the question states that we are testing for differences in mpg between the three car models, we can conclude that at least two car models have different mpgs. Thus, the best choice is B.

To Test the Mileage Efficiency of Three New Car Models,random