This is personal study note Copyright and original reference: https://www.youtube.com/watch?v=--lSPtpGvJ0&list=PLsri7w6p16vvQCo9pmuRNY_SYoOGB6bWM&index=5 ================================================================================ alpha: 5% ================================================================================ Establish hypothesis Sample statistic Pooled variance estimation ================================================================================ statistic t ================================================================================ Confidence interval ================================================================================ ================================================================================ Confidence interval