A test is conducted to compare the tread wear of certain type of tires on highways paved with asphalt and highways paved with concrete. Road tests were conducted with the same type of tires on two types of highways. Summary data on the mileage of the tires up to a certain level of wear are given below. Sample Size Sample Mean Sample SD
Asphalt 35 29,700 9,700
Concrete 35 25,500 7,800
Does this information suggest that tires wear faster on concrete-paved highways than asphalt-paved highways? Test using
α= 0.01.