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

[Michael Dewey]

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
http://www.dewey.myzen.co.uk/home.html