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1-tail vs. 2-tail hypothesis test

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Do you think a 1-tail test or a 2-tail test is a more conservative research approach? Define what you mean by conservative and could you please explain your answer.

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Solution Summary

This posting gives an example to illustrate how a 1-tail and 2-tail test differ in terms of their conservative results.

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See attached diagram.

When doing a research study, you might not actually know in advance how the data will turn out. This is called non-directional hypothesis.

For example, we can assume that increased training in work setting will reduce errors. In this case, we could probably use a 1-tail test, since we know the direction of how the data will move.
Ho: There is no difference in errors
Ha: Training reduces errors

However, what if you ...

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