@Yogi DMT,
Yogi DMT;101674 wrote:I understand how simple probability situations function but logically, it doesn't make sense.
Scenario: A coin is tossed and there is a 50% of it landing on heads and a 50% chance that it will land on tails. The probability of getting heads/tails twice in a row is 25% (.5 x .5). This 25% probability refers to the situation as a whole (not to any particular toss in the sequence).
So, a coin is tossed and lands on heads. The next toss is either 50% heads or 50% tails. To overall probability of the situation says that tails is then more likely an outcome, because that would satisfy the higher probability (h+t = 50%, h+h = 25%, t+t = 25%) which would of course be more likely. So after the first toss results in heads, the second tossed is supposedly more likely to be tails when you look at the overall situation regardless of the probability of the 2nd toss alone is half and half... According to probability, the first toss and the probability of the 2 tosses combines determines a different probability for the second toss other than the 1/2 and 1/2 probability of heads and tails.
I know i'm missing something, why is this?
The probability of the compound event of two heads is .25
But for any given trial, what happened to the coin before is entirely irrelevant. It might have landed heads up before, tails up earlier, been in your pocket, stuck to a piece of gum on your boot heel, flattened into a tiny souvenir plate then restored, etc.
and btw there is no cosmic law that makes coins fall heads up if they've fallen tails up for a good long while or vice versa ... it could happen that a coin falls heads up 64 times in a row and though the odds aren't terribly good it could happen
---------- Post added 01-07-2010 at 01:43 PM ----------
xris;109771 wrote:The problem with using it to determine a debate, it can be abused. Science is very good at abusing its laws on probability, if it does not know it will say, in all probability. Science should not, can not be so flippant. If it cant pick a winner, it should not determine scientific facts by these vague assumptions.
pretty much everything we know is somehow inductive
whether the sun rises tomorrow or whether penicillin and its derivatives kill bacteria ... all the evidence we have for the two is based on some form of inductive reasoning
and btw scientists don't abuse statistics so much as they misuse them (out of ignorance)
and btw statistics when used properly are by no means vague