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Help me relearn statistics
AresProphettake the weakest thing in youand then beat the bastards with itRegistered Userregular
I somehow got a 5 on the AP stats test back in high school, and I can't remember a damn thing from the class. Mostly, I just need to know how to solve a specific type of problem (it's not in any way school-related, nor is it gambling-related despite the example), though a site that gives a general overview of stats math would be really nice. The problem is simplified below.
Say I'm playing a shell game, where someone puts a coin under one of three shells at random, shuffles them, then I get to guess which one has the coin under it. The probability of being right p = .33, that's easy. I can also figure out the probability of losing/winning a certain number of times in a row (p^n and [1-p]^n). What I can't remember is how to calculate what the odds are of getting a certain number of guesses right, with a fixed n. How can I calculate the probability of winning exactly 4 out of 15? Or more than 3 out of 10? Or less than five out of twenty?
I should remember this, and I don't, and it's embarassing.
the world won't listen to this song
and the radio won't play it
but if you like it sing along
sing 'cause you don't know how to say it