Bathtub Water Levels
http://illuminations.nctm.org/LessonDetail.aspx?ID=L388
A lesson plan for grades 9–12 Mathematics
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In this lesson, one of a nine-part unit from Illuminations titled “Interpreting the ‘Real-Life’ Meaning of Graphical Representations of Data,” students examine real-life data that illustrates a negative slope. Students interpret the meaning of the negative slope and y-intercept of the graph of the real-life data. By examining the graphical representation of the data, students relate the slope and y-intercept of the least squares regression line to the real-life data. They also interpret the correlation coefficient of the least squares regression line. This lesson incorporates an interactive regression line applet.
North Carolina Curriculum Alignment
