Question

in order to find the percentage of households in a town that own more than one vehicle, a survey asks 1000 randomly selected drivers at a gas station how many vehicles are owned in their household. from the results of the survey, it is reported that 67% of households in the town have more than one vehicle.
why is this report biased?
a. a random sample was used.
b. the sample size was too small.
c. a survey should not have been used.
d. households without a vehicle were not surveyed.

Explanation:

The sample is biased because it only surveys drivers at a gas station. Households without a vehicle are not surveyed, which means the sample does not represent all households in the town. This is a form of selection bias.

Answer:

D. Households without a vehicle were not surveyed.