descriptive statistics|inferential statistics|Observational Studies| Designed Experiments

descriptive statistics组织和总结信息,为自身(可以是population也可以是sample)审视和探索,

inferential statistics.从sample中推论population情况并评价推论可信度

在population中精挑细选出sample

descriptive statistics|inferential statistics|Observational Studies| Designed Experiments

 

 

Observational Studies:观察

 and Designed Experiments施加控制和影响,再观察

Observational studies can reveal only association(即事实一与事实二有关系), whereas designed experiments can help establish causation(事实一导致了事实二)

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