Is there an association between the weight of an animal’s body and the weight of the animal’s brain? Use the data in the table to make a scatter plot. Are there any outliers?

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22.3: Animal Brains

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22.3: Animal Brains

1. After removing the outliers, does there appear to be an association between body weight and brain weight? Describe the association in a sentence.

2. Using a piece of pasta and a straightedge, fit a line to your scatter plot, and estimate its slope. What does this slope mean in the context of brain and body weight?

3. Does the fitted line help you identify more outliers?

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are you ready for more?

Use one of the suggestions or find another set of data that interested you to look for associations between the variables.

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Lesson Summary

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22.5 Cool Down: Drawing a Line

1. Draw a line on the scatter plot that fits the data well.

2. A new point will be added to the scatter plot with x = 4. What do you predict for the

y-value of this point?

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Reflections

Can you use the slope of a line fit to data in a scatter plot to say how the variables are connected in real-world situations?

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Practice Problems

Must do all problems!

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Lesson Video

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