1. Best Fit Lines & Scientific Hypotheses

2. Bellringer question What is the y-intercept and slope of this line?

3. y-intercept = 1 slope = 1/2

4. Scatter Plots A scatter plot is a graph of (x,y) points, but without a line connecting all of them.

5. Scatter Plots A best fit line is a line that is close to the points in a scatter plot.

6. Picture from Wikipedia, Author Sandbh

7. Experiments in Panama We know that tree seeds are sometimes killed by fungus. How do seeds defend themselves? Are there ways to classify how different fungi act? Photo by Simon Stump

8. The Experiment Took clean seeds, and exposed them to different kinds of fungus. Measured if the fungus attacked the seeds. Photo by Simon Stump

9. Hypothesis 1 Specialist fungi will have higher infection rates (positive slope). Data from Stump and Arnold, Unpublished

10. Hypothesis 1 Specialist fungi will have higher infection rates (positive slope). Data from Stump and Arnold, Unpublished

11. Hypothesis 2 If a fungus has a really high infection rate, then related fungi should also have a high infection rate. (positive slope) Data from Stump and Arnold, Unpublished

12. Hypothesis 2 If a fungus has a really high infection rate, then related fungi should also have a high infection rate. (positive slope) Data from Stump and Arnold, Unpublished

13. Activity Data from Stump and Arnold, Unpublished