3.The table below shows the gas mileage (in miles per gallon) of 8 cars with and without using a fuel additive. At, a= 0.10 is there enough evidence to conclude that the fuel additive improved gas mileage?

Car 1 2 3 4 5 6 7 8

without 35.8 37.7 39.4 36.8 36.6 33.7 38.4 37.3

with 36.2 39.8 40.1 39.3 36.9 34.5 38.8 39.1

a)

b)

c)

d)

e)