Pro Tip: If you cannot afford the book, buy a used physical copy (which costs roughly $5–$10 in local currency) or use a library copy. Scanning a few pages for personal reference is fair use; distributing the entire PDF is not.

Chaudhry’s book is famous for its "Theorem" sections. Do not skip them. Examiners love asking:

Moving away from normal distribution assumptions, this chapter introduces the Chi-Square test, which is vital for categorical data.

For decades, students of statistics in Pakistan, India, and across South Asia have relied on a single, authoritative textbook to navigate the complexities of inferential statistics. That book is by the legendary author Prof. Sher Muhammad Chaudhry and Dr. Shahid Kamal.