Charts and Data Storytelling
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Learning Objectives
- 1Identify the right chart type for a given set of data
- 2Match each chart shape to the data question it answers best
- 3Read titles, axes, and labels to pull a clear message from a chart
- 4Use a chart to tell a short data story instead of just listing numbers
Mini Lesson
A chart is not a decoration — it is a sentence made of shapes. When you pick the right chart, the shape itself tells the story before the reader even reads a number. When you pick the wrong chart, the story gets lost in the noise. Data storytelling is the skill of choosing the chart whose shape matches the question you want to answer.
The Five Chart Shapes You Should Know
- Bar chart — bars side by side. Best for comparing separate categories (favorite sports, books read by class).
- Line chart — points joined by a line. Best for showing change over time (temperature each day, scores each week).
- Pie chart — a circle cut into slices. Best for showing parts of one whole (how a class voted, where money is spent).
- Scatter plot — single dots on two axes. Best for spotting a relationship between two numbers (study hours and grade).
- Histogram — touching bars over number ranges. Best for showing how often values fall in each range (heights, ages).
Match the Chart to the Question
- Asking "which is biggest?" across categories — use a bar chart.
- Asking "is it going up or down?" across days, months, or years — use a line chart.
- Asking "what share of the whole?" — use a pie chart (and only when slices add to 100%).
- Asking "do these two numbers move together?" — use a scatter plot.
- Asking "how often does each value happen?" — use a histogram.
Reading a Chart in Five Seconds
- Read the title — what is this chart about?
- Read both axis labels — what is being measured, and in what unit?
- Find the biggest and the smallest — these usually carry the story.
- Look for a trend — is the line rising, falling, or flat?
- Say the message in one sentence — that is your data story.
Common Chart Mistakes to Avoid
- Using a pie chart when slices do not add up to a whole.
- Using a line chart for categories that are not in time order.
- Cutting the y-axis so a tiny change looks huge.
- Forgetting the axis label, the unit, or the chart title.
- Squeezing twenty categories into one bar chart — the message disappears.
Tip: write the chart’s message in one sentence before you build it. If you cannot say the story in words, the chart will not say it either.
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