Question

Which of the following hypotheses is a one-tailed test? Group of answer choices

a. Hybrid cars get better gas mileage than traditional cars
b. There is a difference in the gas mileage of cars and trucks
c. There is no difference in gas mileage among two-door and four-door vehicles
d. There is a relationship between the number of miles to one's job and the gas mileage associated with his or her chosen car
e. All of the above are one-tailed tests

Answer 1

The correct answer is letter "A": Hybrid cars get better gas mileage than traditional cars.

Step-by-step explanation:

One-Tailed Tests are statistical studies conducted to show that a given sample has higher or worse features than the total population. The two outcomes cannot happen. Only one will be the result of the test. The researcher, in such a case, conducts the study in one direction and does not consider the other possible outcome.

Then, the research on hybrid cars attempts to prove they are better in gas mileage compared to regular vehicles. Therefore, the researcher is using the one-tailed test approach.