Statistics helps you understand Data Science in a more concrete way. Using in-built Python functions will make your path easier, but it's always good to understand the concepts in depth. We have divided the complete book in 3 levels. Level 1 - Basics functions and programs to get your hand dirty in Python Level 2 - You will be recreating the mean, median, mode, variance, etc. formulas by yourself Level 3 - An advance level to understand different tests and distribution All the codes are in Python and we have tried hard to reduce the number of in-built functions