Following resources helps to understand practicality in Stats Models.
Generalized Stats Models
Sampling Distribution Mean
Scipy.stats
Think Stats book by Allen Downey
Stat Methods
Modern Statistics
Blog on statistical Modeling
A/B tesing
Sequential Probability ratio test
Early Stopping
Law of Total of Variance
Power of Stats
Stack exchange discussion
CLT on binomial
Udacity
Data Science Blog
Blog Entries: