username225218
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I'm doing some work on Krakow and Lynn's 2003 experiment on the age of witnesses in factors affecting eye witness testimony. I was asked to give a directional hypothesis and then asked why you would use a directional hypothesis. I understand what each type of hypothesis is etc, but could someone explain the reasons you would use a directional hypothesis as opposed to a non-directional hypothesis. I'm not sure if the study would be necessary for this, but it's above just in case xD

Thank you (:
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Melana
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Directional hypotheses identifies a specific direction in a relationship, whereas non-directional hypotheses do not. They're used when you already know a certain amount of knowledge about a subject so I suppose you're making more of a point with a directional hypothesis - your results would confirm what you thought, the point you were trying to make, whereas a non-directional one might have less of an impact. Hmmm.
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squeak
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if you have previous knowledge and can establish a directional hypothesis, you would test for that hypothesis. this means it's one tailed so you'd only test the postive or negative effect, there's no need to test both (two tailed) because it's not of importance, you already know the direction.
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