Fathom Activity 3

Create a Scatterplot and Line of Best Fit

Data required: Page 40 (tree height data from Focus L)

•	Open Fathom.
•	Click and drag a New Case Table  into the screen.  
•	Label the two columns of the table: Age and MeanHeight
•	Under these headings enter the data from pg 40 of your text.
•	Click and drag a New Graph  into the screen.
•	Highlight the entire Age column and drag it to Drop an Attribute Here (the x-axis).
•	Highlight the entire MeanHeight column and drag it to the y-axis of the graph. 
•	The graph should automatically change to Scatter Plot (identified in the top right corner of the graph).
•	Your screen should now look like this:

•	Select the graph. Under the Graph menu in the toolbar select moveable line.
•	Move and reposition this line on your graph until you think it is the line of best fit. 
•	Next, under the graph menu, select Median-Median Line. The graph must be selected for this to be accessible.
•	Notice that each of the lines is a different colour. Therefore, you can see how closely your line of best fit matches the actual one. 
•	Save this as FathomAct3.