A One-Tailed Test Should Be Used When

Multiple Choice

A one-tailed test should be used when

A) there is reason to believe the outcome will point in a particular direction
B) the experimenter so chooses; it is a matter of personal preference
C) the outcome of a test is in a particular direction
D) there is no practical difference in meaning between finding that the null hypothesis is true and finding that a difference exists in a direction opposite to that stated in the directional alternative hypothesis