1. Think About the Process The scatter plot shows data that suggest a linear association.
a. Find an equation for the trend line using the points (3, 29) and (13, 15).
b. How can you decide which points are the outliers?
c. Find the outliers.
d. Remove the outliers. Find a trend line for the adjusted data using the points (2, 28) and (12, 22).
e. How do the outliers affect the position of the trend line?
2. The scatter plot shows data for the circumference and height of a variety of tree. The plot suggests a linear association. The summary points are (50, 30), (125, 37), and (200, 99).
a. Find the median-median trend line.
b. Estimate the height of a tree that has circumference 80 in.