Question

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 Standard Dev.
Asphalt 35 29,700 25,500
Concrete 35 9,700 7,800
Does this information suggest that tires wear faster on concrete-paved highways than asphalt paved highways?

Answer 1

Yes it does

Explanation:

We can use two sample t-test to draw the conclusuion. However, by looking at the information of mileage of tyres on asphalt and concrete-paved highways, we can say that since mean milege of tyres on concrete is lesser, tyres wear faster on concrete-paved highways.