Suppose that a researcher wants to know if a new flu drug affects people, either by making them better or worse. Would this be a one-tailed or two-tailed test and why?
A)One-tailed because only one issue is discussed-the drug
B)One-tailed because there is only one interaction, which is between the flu and the drug
C)Two-tailed because there are two variables-whether or not people take the drug and how their flu is affected
D)Two-tailed because there is no predicted direction of the effect of the drug

Question

Quizplus · Accepted Answer

A two-tailed test is appropriate when there is no predicted direction of the effect of the drug. In this case, the researcher wants to know whether the new flu drug affects people either by making them better or worse, without a specific prediction of which direction the drug will have an effect.

Suppose That a Researcher Wants to Know If a New