CAST contains several alternative e-books that cover the material in an introductory statistics course. This is the 'business' e-book — it uses data sets and scenarios from business, commerce and economics. Other e-books use examples from different subject areas.
Since similar statistical methods are used in most application areas, the statistical concepts covered by the different e-books are mostly the same. You can therefore study any CAST e-book to learn these concepts. However you may find it more interesting to read applications that are related to your professional interests if a more relevant CAST e-book has been written.
After looking at the introductory video, you can move directly to Chapter 1 where you will learn about the importance of using data when making decisions, typical data structures and the need to use statistics to get useful information from data.