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March 25, 2017

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What are significance/alpha levels and how does using a one versus a two tailed test affect significance levels?

  • Psychology/Math - ,

    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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