今年秋天要去学统计master。以前文科，数学属于美国人水平。。。

请问统计的下面三本教材从易到难，看的顺序是什么? 谢谢

1. Probability and Statistics by Morris Schervish and Mark DeGroot
2. Statistical Inference by  George Casella and Roger L. Berger
3. Introduction to Mathematical Statistics 6th edition by Robert V. Hogg,
Allen Craig, Joseph W. McKean

感激万分！