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statistics question...

H

homestarmy

Diamond Member
Well I have a question for homework that asks why values of 't' are negative in a independant samples t-test. It says that if I have a statistics textbook, examine the formula for t... but there is no statistics textbook assigned for this class!

Just thought there might be a stat genius in the house!
 
I'm thinking that it happens when the first mean is smaller than the second, is there another or more detailed reason?
 
the negative value really doesn't mean anything in the probability sense, it just tells the direction of the deviation. The importance is the area under the curve of the PDF.
So if the true mean is 45, your hypothesis of 40 and 50 isn't going to matter in a two-sided test because they both deviate 5.
 
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