Data Visualization: Creating Charts and Graphs

Learning Objectives Identify the key parts of a chart, including the title, axes, and labels. Explain the difference between a bar chart and a pie chart and when to use each. Translate a simple data set (like a list of favorites) into the information needed for a chart. Write simple, text-based commands (pseudo-code) to generate a bar chart. Analyze a chart to answer questions about the data it represents. Identify and correct common errors in a chart, such as missing labels or an incorrect title. Have you ever voted in a poll on YouTube or a game and seen the results pop up as a colorful chart? 📊 Let's learn how computers turn votes into pictures! In this lesson, we'll explore how to turn boring lists of information, called data, into exciting charts and graphs....

TermDefinitionExample Data SetA collection of related information or facts, like a list of numbers or words.A list of students' favorite pets: ['Dog', 'Cat', 'Dog', 'Fish', 'Cat', 'Dog'] Bar ChartA chart that uses rectangular bars to show how large each value is. The bars can be vertical or horizontal.A chart with a bar for 'Dogs' at a height of 3, a bar for 'Cats' at a height of 2, and a bar for 'Fish' at a height of 1. Pie ChartA circular chart divided into slices to show a part-to-whole relationship. Each slice represents a percentage of the total.A circle chart showing that 50% of students chose Dogs, 33% chose Cats, and 17% chose Fish. X-AxisThe horizontal line at the bottom of a chart that...

Bar Chart Creation Pattern create_bar_chart(categories, values, title) This is a common pattern in coding for making a bar chart. You provide a list of category labels (like pet names), a list of their corresponding values (the counts), and a title for the whole chart. Data Counting Loop For each item in a data list, count how many times each unique item appears. Before you can make a chart, you need to analyze your raw data. This pattern involves going through your data set and counting the occurrences of each category to get the numbers you need for the Y-Axis.