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# YouTubeT2-8 Covariance: population vs. sample, and relationship to correlation

#### Nicole Seaman

Staff member
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Covariance is a measure of linear co-movement between variables. Independence implies zero covariance, but the converse is not necessarily true (because variables can be dependent in a non-linear way).

Here is David's XLS: http://trtl.bz/2B9nqdO

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