In which of the following situations would you be most likely to use a one-tailed rather than two-tailed alternative hypothesis?
A) The hypothesized effect can only be in one direction.
B) You want to set α at .10 rather than .05.
C) Your sample is very small.
D) You don't expect or want to reject the null hypothesis.

Question

Quizplus · Accepted Answer

A one-tailed alternative hypothesis is appropriate when the hypothesized effect can only be in one direction. This is because a one-tailed test focuses all of the α in one direction (either in the upper or lower tail of the distribution), increasing the power to detect significant effects in that direction.

In Which of the Following Situations Would You Be Most