For information to be true you need actual evidence and reasoning to conclude so. I'm guessing you believe anything anyone tells you.
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Based on a Chi square test and degrees of freedom you can easily determine whether an occurance is due to chance or some other factor.. I'm not sure how this post is drawing so much negative attention..
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We don't have access to all the data that we could possibly want. But the calculation is plausible with the data we DO have.
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Why? All we know is that it's random. That's it. Things that are unlikely can and do happen.
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Yes, and that is the purpose of the calculation...
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Yes, but that's not how the calculation is made. It's false.