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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