A one-tailed test is associated with
A)the research hypothesis.
B)the null hypothesis.
C)a nondirectional hypothesis.
D)a directional hypothesis.

Question

Quizplus · Accepted Answer

A one-tailed test is associated with a directional hypothesis, which states the direction of the effect or relationship being tested (e.g. "the treatment will decrease symptoms"). In contrast, a nondirectional hypothesis (e.g. "there will be a difference") would require a two-tailed test, which considers the possibility of the effect occurring in either direction. The null hypothesis is the default position that there is no significant difference or relationship, and is tested against the research hypothesis.

A One-Tailed Test Is Associated with