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? 

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?

Earlier, your class gathered data on the number of pages and weight of books.

1. Sometimes the average weight per page of a book is about 1 ounce per 50 pages. Is this true for any of the books you measured?

2. Make a scatter plot for the number of pages and weight data, and describe any association.

   

3. Is the line a good fit for the data? If so, explain why. If not, find the equation of a line that fits the data better.