A stakeholder asks why you are using a two-tailed test instead of a one-tailed test to detect improvement. What is the best justification?
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A
Two-tailed tests always have lower p-values
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B
A two-tailed test guards against missing unexpected effects in either direction and avoids bias toward expected outcomes
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C
One-tailed tests require larger samples
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D
Two-tailed tests are required by software defaults