confidence intervals:

if want to use normal distribution, has to check N*p > 5 and N(1-p) > 5

margin of error=z*SE=z*sqrt(p(1-p)/n), z=1.96 if alpha=5%

confidence interval: [p-MOE, p+MOE]

Hypothesis test

alpha=P(rejected null | null is true) 错判

beta=P(fail to reject null | null is false) 漏网之鱼

power=1-beta