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
Which of the following situations does not require signed consent forms from
participants?
A.A study of cereal preferences among children ages 9-12
B.A study of the effectiveness of prescription arthritis medications
C.A study of travel preferences among frequent fliers
D.A study that requires information about the medical history of participants
E.All of the examples require signed consent
Which of the following is true of focus group interviews?