Discuss the below:
Q: To learn about the effect of a newly developed gasoline additive on gas mileage (mpg), seven cars were driven 300 miles first without additive and then 300 miles with a gas additive. Here are the mpg's. Did the new additive improve gas mileage? Also, is the test dependent or independent.
Car # mpg without additive mpg with additive
1 24.2 23.5
2 30.4 29.6
3 32.7 32.3
4 19.8 17.6
5 25.0 25.3
6 24.9 25.4
7 22.2 20.6