February 19, 2017

Homework Help: Statistics

Posted by Sam on Tuesday, December 8, 2009 at 11:03pm.

I'm confused about significance tests. I've tried to look up what it means for the p to be less than the alpha but none of the explanations made sense. I understand that the alpha is the probability of wrongly rejecting the null hypothesis but I'm not sure about the t and p that must also be calculated. I don't understand why the alpha must be picked arbitrarily and why the calculated probability must be less than the value of alpha in order for the null hypothesis to be rejected. Also, why are significance levels complements of confidence levels? Please help me understand. Thank you!

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