1. Introduction to Data Visualization: Principles and Best Practices

Learning Objectives Define 'data' and 'data visualization' in their own words. Identify the key parts of a simple bar chart, including the title, axes, and labels. Explain why data visualization helps people understand information faster than just looking at a list of numbers. Transform a small set of data (e.g., a class survey) into a correctly labeled bar chart on paper. Apply two best practices for creating clear charts: giving it a title and labeling the axes. Look at a simple bar chart and answer a question about the data, such as 'Which category is the most popular?' Have you ever tried to explain your favorite video game just with words? Isn't it easier with a picture? 🖼️ Data is the same way! Today, we're going to learn how to...

TermDefinitionExample DataPieces of information or facts that we can collect. Think of data as the ingredients for our chart.The number of students in our class who have a pet dog (10), a cat (8), or a fish (3). Data VisualizationThe superpower of turning data (lists of numbers and words) into a picture, like a chart or a graph.Making a bar chart to show the pet data, so you can see right away that dogs are the most popular pet. Bar ChartA picture that uses rectangles (bars) to show and compare data. Taller bars mean bigger numbers.A chart with a tall bar for 'Dogs', a medium bar for 'Cats', and a short bar for 'Fish'. Axes (singular: Axis)The two lines on the bottom and side of a chart that are like rulers. They tell us what we are measuring.The bottom line...

The Title Rule Every chart must have a title. Always put a clear title at the top of your visualization. This is the first thing people read and it tells them exactly what story your data is telling. The Labeling Rule Label both axes. You need to tell people what the bars represent and what the numbers on the side mean. The bottom axis (x-axis) usually tells you *what* you are comparing, and the side axis (y-axis) tells you *how many*. The Match-the-Data Rule Make sure your bars are the right height. The top of each bar must line up with the correct number on the side axis. If 8 students chose cats, the 'Cat' bar must go up to the number 8.