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A pile of numbers tells you little. A good chart can tell you a lot.

This is Data Visualisation & Analysis. It uses what you know about tables, sorting and bar charts. Your school handbook has a chapter on the same topics. This track covers its main ideas.

What you will learn

• Two shapes of data. Rows and columns, or no fixed shape.
• Four ways to collect. Watch, ask, measure, or let a device record.
• File formats. The file decides what you can do with the data.
• Clean first. Remove copies, fix errors and fill gaps.
• Bar, line or pie. Pick the chart that answers the question.
• Reading a chart. Title, labels, unit and trend, the way values move.
• Precise or accurate. Precision and accuracy are not the same.

Need a quick recap?

• A table — rows are records, columns are fields.
• Sorting and filtering — they change what you see, not what is there.
• A bar chart — a taller bar means a bigger count.