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Lesson 3: Dot Plots and Line Plots

About 30 minutes — Discussion-based lesson

What You Will Learn

This lesson covers:

What a dot plot is: dots stacked above a number line

This section covers the key ideas about what a dot plot is: dots stacked above a number line. Discuss with your group or family and explore the concepts together.

When to use dot plots: showing distribution of numbers

This section covers the key ideas about when to use dot plots: showing distribution of numbers. Discuss with your group or family and explore the concepts together.

How dot plots reveal clusters, gaps, and outliers

This section covers the key ideas about how dot plots reveal clusters, gaps, and outliers. Discuss with your group or family and explore the concepts together.

Reading a dot plot: what does the shape tell you?

This section covers the key ideas about reading a dot plot: what does the shape tell you?. Discuss with your group or family and explore the concepts together.

Check Your Understanding

1. What is a dot plot?

Answer: A display where each data point is a dot placed above its value on a number line. Multiple dots stack up to show how common each value is.

2. What patterns can you see in a dot plot?

Answer: Clusters (where most data is grouped), gaps (empty spaces), and outliers (dots far from the rest). The shape tells you how the data is spread out.

3. When should you use a dot plot?

Answer: When your data is numerical (numbers, not categories) and you want to see how the values are distributed — where they cluster and spread.

4. What is an outlier?

Answer: A data point that is far away from the rest. If most students scored 70-90 on a test but one scored 20, the 20 is an outlier.

Key Takeaways

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