Dear Matti
On 08/09/2016 13:06, Matti Viljamaa wrote:
I’m trying to do a t-test, where the null hypothesis for the two data sets has
to be:
“the means are the same”/“difference in means is equal to one”
That is two statements not one. Do you mean that your null is that the
difference is 1? If so just subtract 1 from all the scores in the group
which is predicted to be higher and run the t-test on the resulting scores.
Using the t.test function in R I’m able to see that it uses the following
“alternative hypothesis”:
alternative hypothesis: true difference in means is not equal to 0
It means that the null is that the difference is zero.
but does not seem to specify null hypothesis. I believe alternative and null
hypotheses are different, although
I don’t exactly know how.
So what should I use for my t-test? Or is t.test ok?
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Michael
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______________________________________________
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