This is personal study note Copyright and original reference: https://www.youtube.com/watch?v=uzsNpYSiXjY&list=PLsri7w6p16vtEz_J1G7HQG-Rm8vpZPtPS&index=2 ================================================================================ test based on "mean" ================================================================================ Establish hypothesis ================================================================================ Create p-value $$$\alpha$$$: probability of wrong ================================================================================ Left side test and Right side test ================================================================================ Example ================================================================================ left sided test