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Old 11-28-2011
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Stats Probability Calculation; Mutual Exclusive and stuff

I cant understand the key probabilities based question, find them very confusing I mean I cant differentiate whether the data in the questions are based on mutually exclusive principle or independent can anyone advice me something
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Old 11-28-2011
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I was in the same place you where, i think the way they explain it on the Kaplan lectures with those titles just makes it worst.

Let me help you with the big picture.

Just learn the Rules, and memorize this 2 examples, stop trying to understand those confusing titles.

OR is add
And is X

So, if you are at a poker game, what are the probabilities to have Hearts OR Diamonds in a hand? They will probably give you the probabilities in the vignett. Probs of getting Hearts 0.25, or Diamonds 0.25 just add them=.50 chances of getting hearts or diamonds. The clasic example is tales or heads which is 0.5+0.5= 1=100%

The other example is what are the chances of getting a patient with Cancer (0.2) AND squizophrenia(0.25) , just multiply them. The chances of having a patient with both Squizo and Cancer is 0.0025

Those two rules, are the big picture, at least it worked for me
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