Proof: Ratio of Sample and Population Variance has a Chi Squared Distribution

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This video shows how to prove that n-1 times the ratio of Sample Variance over the Population Variance has a Chi Squared Distribution.

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I have been watching some of your videos on stats derivations and must say they are extremely well made and easy to learn from. Please keep up the great work.

professormcloughlin
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couldn't understand the 9:23 part

rahulpaul
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I think there's a mistake at 37:09

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