L12.6 Covariance Properties

https://youtu.be/RQKJBpaCCeo

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L12.7 The Variance of the Sum of Random Variables

https://youtu.be/GH7dwoXSD0s

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L12.8 The Correlation Coefficient

https://youtu.be/HTs6Zhc2S1M

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L12.9 Proof of Key Properties of the Correlation Coefficient

https://youtu.be/uxVRfj60z98

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L12.10 Interpreting the Correlation Coefficient

https://youtu.be/J3aMHIajtFc

위의 예식에서는 correlation값이 1/2이 나왔다 . correlation 값이 0인 경우 두 random variables이 관계가 없다. independent하다고 할수 있다. 

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