Astudy is done to compare the fuel efficiency of cars. the first group of cars generally get about 39 miles per gallon. the second group of cars generally get about 39 miles per gallon. based on the mean values of each group, what inference can be made? what else might a person conclude from the mean values? which of the following is a correct inference based on the mean values?

a. the cars in group 1 generally are more fuel efficient.

b. the cars in group 1 and group 2 are equally fuel efficient.

c. the cars in group 2 generally are more fuel efficient.