Lesson Four
Lesson
Introduction <br> This lesson is different; instead of talking about fundamental statistical quantities such as center and spread, we need to spend a few minutes talking about simple arithmetic. In particular, we will talk about how we compare two quantities. <br> In this lesson, you will: Use subtraction to compare two quantities when you are interested in knowing the absolute difference Use ratios to compare two quantities when you want to know the relative difference between them Understand that using difference and using ratio — have fundamental, important differences