A researcher plans to apply a one-tailed test of significance when analyzing data from a study.Which is true about using this test?
A) The researcher will be unable to predict whether differences are greater than or less than the mean value.
B) This is a nondirectional hypothesis,so values will not tend to vary in a specific direction.
C) This may increase the possibility of a type I error when evaluating the significance of the findings.
D) This will decrease the possibility of a type II error when drawing conclusions about the data.

Question

Quizplus · Accepted Answer

A one-tailed hypothesis means that the data tend to vary in a certain direction.One-tailed statistical tests are uniformly more powerful than two-tailed tests and decrease the possibility of a type II error.A one-tailed hypothesis increases a study's power and improves the ability to predict outcomes.A one-tailed test is a unidirectional hypothesis,with values tending to vary in a specific direction.A one-tailed test does not increase the chance of a type I error.

A Researcher Plans to Apply a One-Tailed Test of Significance