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

Question

Quizplus · Accepted Answer

A one-tailed test hypothesis is directional and predicts the direction of the expected difference. The hypothesis "Hybrid cars get better gas mileage than traditional cars" predicts a specific direction of difference (i.e. that hybrid cars will have better gas mileage than traditional cars).

Which of the Following Hypotheses Is a One-Tailed Test