This is personal study note
Copyright and original reference:
https://www.youtube.com/watch?v=m_AUjFI969c&list=PLsri7w6p16vtEz_J1G7HQG-Rm8vpZPtPS&index=7&t=15s
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Test hypothesis on population variance:
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Sample variance follows $$$\chi^2$$$ distribution
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Example
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Company insists that population variance is 6.25
But that $$$H_0$$$ is rejected