Lesson Three
Lesson
Introduction <br> The first two lessons have reviewed the median and the mean, two measures of center. You probably knew about them before, but we hope you got some additional insights into them in these lessons. <br> We have spoken about center. Now we turn to spread and how to make it quantitative. We will also continue our theme of comparing groups, now using spread as the “measuring stick” to measure differences in center. <br> In this lesson, you will: Understand spread as the “measuring stick” to measure differences in center. Learn how to make spread of a distribution quantitative by using Interquartile Range (IQR) and Standard Deviation Study the effects of outliers on IQR and standard deviation