Assemble students in groups of 2‐3 with a calculator and ruler for each group. Using the sheet ‘Example: Regression’ have the students examine the scatter plot of growth rings by tree diameter. Have the students consult and draw an approximate best linear fit line through the points. Have them compare the position of the line, the y‐intercept, and the nearest (x, y) coordinates to those in the associated ‘Calculations’ section. How well did they approximate the line?
Next, explain they will be measuring biological data and calculating variables to exactly determine the mean x and y coordinates, slope, and y‐intercept. To compare their calculations to their estimation skills, have the students measure the diameter and count the growth rings of the sample trees on the ‘Regression Exercise’ sheet, entering the data into the table provided. Next have students plot the data. Then have the students calculate the mean of the x data and the mean of the y data. Have the students draw their own line of the best fit.
This module is part of a collection of educational materials developed for use in teacher workshops and classrooms. The target student audience is listed on each file. These activities include a combination of math concepts and biology applications, ranging from elementary school to Algebra 1 level.
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