Hypothesis Testing process 假设检验过程 Assume the population mean age is 50 (Null Hypothesis) Population lsX=20=50? The Sample Mean Is 20 No, not likely ■■■■I ■■■ Null Hypothesis 回■ SamplePopulation Assume the population mean age is 50. (Null Hypothesis) REJECT The Sample Mean Is 20 Null Hypothesis Sample Is X = 20  m = 50? Hypothesis Testing Process 假设检验过程 No, not likely!