Example 1

Pablo’s science class is growing plants. He recorded the height of his plant each day for 10 days. The plant’s height, in centimeters, over that time is listed in the following table. Pablo determines that the function is a good fit for the data. How close is his estimate to the actual data? Approximately how much does the plant grow each day?
  1. Create a scatter plot of the data.
  2. Draw the line of best fit.
  3. Find the residuals for each data point.
  4. Plot the residuals on a residual plot.
  5. Describe the fit of the line based on the shape of the residual plot.
  6. Use the equation to answer the question.
This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information on their resources.