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 ================================================================================ Test hypothesis on population variance: ================================================================================ Sample variance follows $$$\chi^2$$$ distribution ================================================================================ ================================================================================ Example ================================================================================ Company insists that population variance is 6.25 But that $$$H_0$$$ is rejected