Introduction

Different people collect data for different reasons. For example, someone who wants to sell yogurt might want to know which flavours of yogurt are popular. A teacher would collect data to rank all the students in his/her class.

The yogurt seller would use a histogram, or a dot diagram to find out the most popular flavours of yogurt, like this:



However, a teacher would use a stem and leaf diagram to rank the students, like this:

They both use data, but in different ways. Let's explore how data is collected in different ways!