University of Central Florida (UCF) PSY3204C Statistical Methods in Psychology Practice Quiz 3

Question: 1 / 400

What is a two-tailed test?

A test that only examines one direction from the null hypothesis

A hypothesis test considering values only above the null hypothesis

A test that evaluates both directions away from the null hypothesis

A two-tailed test is designed to evaluate the possibility of an effect or difference in two directions, meaning it assesses whether the observed data deviates significantly from the null hypothesis in either direction—both higher and lower values. This approach is essential when the research hypothesis does not predict the specific direction of the effect, allowing for the detection of potential changes that could occur in any direction relative to the null hypothesis.

When choosing a two-tailed test, researchers maintain a broader perspective, as they are interested in knowing if the data is significantly different from the null hypothesis without limiting themselves to just one side (either an increase or a decrease). This flexibility is critical in many psychological studies where the nature of the effect is not strictly known beforehand.

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A test primarily used for measuring strength of impact

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