Question: A statistician wants to determine if there is a difference in the fuel efficiency of cars between model years. To do, he selects random makes

A statistician wants to determine if there is a difference in the fuel efficiency of cars between model years. To do, he selects random makes and models of cars and compares the fuel efficiency in miles per gallon of the current model year and the previous model year.Find the test statistic and degrees of freedom for an appropriate hypothesis test using the data set below. Let the differenced

for each car be computed asd=current model yearprevious model year

. Assume that the fuel efficienciesare normally distributed. Round the test statistic to three decimal places.

previous model

24.6

23.8

25.1

25.4

21.3

23.9

26.4

24.6

22.9

current model

25.3

24.4

25.8

25.9

22.4

25.3

26.7

answer:

t=___. df=____

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