[R] empirical null distribution

[mad_bassie]

I simulated data for the ANOVA-test where the condition of equal variances
was not accomplished. 
I have three groups:
X<-rnorm(50,30,5)
Y<-rnorm(50,30,10)
Z<-rnorm(50,30,5)
(this is just an example....the variables might still change depending on
how clear the results are)

Now I want to construct the empirical null distribution of it.
How do I do this?
Can I make a graph of it?
Could I compare that graph with that of the theoretical null distribution?

Thanks a lot!
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