The necessary conditions having been met, a two-tailed test is being conducted to test the difference between two population means, but your statistical software provides only a one-tail area of 0.156 as part of its output. The p-value for this test will be 0.078.

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Quizplus · Accepted Answer

The p-value for a two-tailed test is twice the one-tail area, so it would be 0.312 (2 * 0.156), not 0.078.

The Necessary Conditions Having Been Met, a Two-Tailed Test Is