do you understand what i am asking?
Thanks
Christie
Wednesday, November 4, 2009
t test meaning
What does t test mean in words? I understand that t test is used when we do not know the sigma of the population. I understand that it doesn't tell us about the variations. But what does it tell us if our output says t= 4 and is significant? what does that mean about our data set (using a sentence)?
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A t-test is the same concept as an f-test only the statistics are different because of the fact, as you mentioned, we do not know anything about the population variance, so cannot use the f-test. The t that shows up in the spss output is somewhat similar to the f in that in the olden days they used to use that number, along with the df of the study in order to determine if the associated statistics were not found by chance (that is, that they are not in the tails of the distribution). It may be beyond what you need to know for the class, but the t-score itself is supposed to be the standard deviations from the mean on a t-distribution (which remember has fatter tails than a normal distribution).
Basically, just like with the f-score, once you find out what the t-score is it is compared to a big chart; then, based on the df in the study, helps to decide whether or not the betas of the study was found by chance.
This is what i know of it...but i am getting most of this from my undergrad text book (Aron, & Aron, 2003). What you stated that you understand in your question seems to be enough information for the scope of this class.
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