Question

abc gasoline wants to prove that its fuel produces more gas mileage in cars than the leading competitors fuel. in a test, one gallon of abc gasoline is put in a car and the car is driven at 50 mph until it runs out of gas. then, the test is repeated using the competitors gasoline in the same car on the same road. the results are shown below.

fuel type	gas mileage	weather conditions
competitor	29 mpg	warm, windy

which of the following is true?
a. abc gasoline can conclude that its fuel produces less gas mileage in cars than its competitors fuel.
b. abc gasoline can conclude that its fuel produces more gas mileage in cars than its competitors fuel.
c. no conclusion can be drawn; there are not enough variables in the experiment.
d. no conclusion can be drawn; the differing weather conditions could have influenced the results.

Explanation:

In a scientific experiment to compare gas mileages, variables should be controlled. Here, weather conditions (calm vs windy) are different during tests of the two fuels. This non - controlled variable could affect gas mileage, so it's not possible to draw a valid conclusion about which fuel is better.

Answer:

D. No conclusion can be drawn; the differing weather conditions could have influenced the results.