MathiasNagy@gmail.com science forum beginner
Joined: 17 Mar 2006
Posts: 1

Posted: Fri Mar 17, 2006 6:12 am Post subject:
Basic question in regards to random sampling



I was hoping someone may be able to assist me with this hypothetical
problem.
A box of 300 white/700 black balls when sampled consecutively and
randomly 1000 times will expect to produce 300 white balls and 700
black, or a 30% chance of producing a white ball during any given
sample. If this process is sampled randomly, rather than consecutively
(e.g. only every 110 samples are recorded), will this still provide a
probability of 30% for a white ball after 1000 samples are
taken/recorded? (The balls are of course returned to the system after
every sample, whether recorded or ignored).
What impact, if any, does the random spacing between recording samples
have on the resulting probability for a white ball being drawn?
Thanks,
~Mathias 
