Dear R,
I am using this R version:R version 2.11.1 (2010-05-31)(Cran Mirror Berlin)
It seems to me, that R constructs a wrong confidence intervall if you try to
get a one sided t-test.
If the true mean is 1 and my alternative hypothesis (H1) says that mu is
smaller ("less")than zero the conf. intervall should reach +â and not -â if
it is constructed for the H0 saying that mu is greater or equal to zero.
> rnorm(20,1)->n
> mean(n)
[1] 1.206958
> t.test(n,mu=0,alternative="less")
One Sample t-test
data: n
t = 9.3976, df = 19, p-value = 1 alternative hypothesis: true mean is
less than 0
95 percent confidence interval:
-Inf 1.429035 sample estimates:
mean of x
1.206958
Hope I am right you can help me if I am wrong.
Greetings,
Ingo Meemken
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