how to approximate correlation?

I missed a class in my beginning stats class and know you figure correlation by take y z-score times x z-score and divide by number of observations-1

What i don't get is it seems know like everyone in my class knows a method of approximating this pretty accurately w/o going through all those steps of figuring x-scores then putting them into equation. What are they doing. Can you explain it to me?>

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  • 1 decade ago
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    i'm not sure what is the best way to answer this question, however, i did stay at a holiday inn express last night!

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