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Statistics
Hypothesis Testing
Significance Levels
What are significance/alpha levels and how does using a one versus a two tailed test affect significance levels?
1 answer
Alpha levels are the probability of rejecting Ho, when Ho is true. If you are choosing P = .05, a two tailed test will be looking for .025 in either direction. If a one-tailed test, you will be looking for .05 in one direction.
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