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 2021-01-27 Answered
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.

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Expert Answer

Alara Mccarthy
Answered 2021-01-28 Author has 4366 answers
Calculation:
The P-value of a one-tailed test is smaller than that of a two-tailed test. Because P-value for two-tailed is twice the one-tailed (left or right) test and the two-tailed test include the area in both tail (left and right). 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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