[R] Is there t.test with null hypothesis?

Rick Bilonick rab45 at pitt.edu
Thu Sep 8 14:39:49 CEST 2016

You need to include the argument "mu=1" (without parentheses). For example:

 > t.test(group1,group2, mu=1)

for a two-sample independent groups t-test. If you type:

 > ?t.test

you can see the help information for the t.test function.


On 09/08/2016 08:06 AM, 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”
> 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
> 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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