How can I find a standard deviation of a simulation of 1000000 replications of the number...
How can I find a standard deviation of a simulation of 1000000 replications of the number of heads in 400 biased coin tosses, (1/10 chance of landing heads) in R?
The code should be sqrt(sd(rbinom(1000000,400,1/10)^2 x (1000000-1)/1000000), but I have no idea why it is set out that way.
Thank you
Homework Answers
Answer:
# X is simulated from 100,0000 draws of a binomial with size 400
and p = .1
> X <- rbinom(1000000, 400, .1)
>
> # Estimate the variance of X
> var(X)
[1] 35.99069
>
> sd(X)
[1] 5.999224
>
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