[R] Question
Uwe Ligges
ligges at statistik.uni-dortmund.de
Tue Dec 13 13:15:14 CET 2005
Davia Cox wrote:
> Hello,
>
> I have a problem that I am trying to solve and I am not sure how to
> do it in R.
>
> Suppose, that 16 numbers are choosen at random from 0 to 9, what's
> the probability that their average will be between 4 and 6. I typed
> the following code:
>
> set.seed(100)
> sample(0:9, 16, replace =TRUE)
> [1] 3 2 5 0 4 4 8 3 5 1 6 8 2 3 7 6
>
> Is what I got, however I realize the set.seed function locks in the
> number I get every time.
Yes, that's what set.seed is intended to do... otherwise don't use
set.seed (and make your work unreproducible).
> My question is in order to run a true random sample,
We have to disappoint you: Your computer cannot generate "true random
samples".
> wouldn't I have
> to use the runif function? And then deliminate the sample to show the
No, if you want integers, the sample above fits perfectly well.
> numbers that lie between 4 and 6? If that's the case, how do I do that?
Is this a homework question?
Uwe Ligges
>
> Davia S. Cox
> 517-575-8031 cell
> davia.cox at gmail.com
>
> "Human potential, though not always apparent, is there waiting to be
> discovered and invited forth." -William W. Purkey
>
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