In 2002, Colorado experienced a drought and many towns on the front range issued either mandatory or voluntary water restrictions on outdoor watering. The data file drought .txt contains data from five front range towns on their June 2001 and June 2002 usage in millions of gallons.
(a) Using the data from the first four towns and only one independent variable, find the best model you can for predicting 2002 values based on 2001 values.
(b) Re-do part (a) using all five data points.
(c) Discuss how the models differ. Consider the small size of the data set in your discussion.