Critical Thinking: One-Tailed versus Two-Tailed Tests For the same data and null hypothesis, is the P-value of a one-tailed test (right or left) larger or smaller than that of a two-tailed test? Explain.

Cabiolab

Cabiolab

Answered question

2021-01-27

Critical Thinking: One-Tailed versus Two-Tailed Tests For the same data and null hypothesis, is the P-value of a one-tailed test (right or left) larger or smaller than that of a two-tailed test? Explain.

Answer & Explanation

Alara Mccarthy

Alara Mccarthy

Skilled2021-01-28Added 85 answers

Calculation: 
A one-tailed test has a lower P-value than a two-tailed test. Because the two-tailed test includes the area in both tails and the P-value is twice that of the one-tailed (left or right) test. For the same data, P-value for one tailed test is 0.0127, then the P-value for two tailed test will be 0.0254.

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