How good is the fit? Using an interactive, classmates create a scatter plot of bivariate data and fit their own lines of best fit. The applet allows pupils to display the regression line along with the correlation coefficient. As a final check, learners can judge the fitness of the lines using residuals.

Concepts

scatter plots, linear equations, line of best fit, correlation, correlation coefficient, linear regression, bivariate data, residuals

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Additional Tags

math

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Instructional Ideas

• Use the interactive any time it is needed to determine a line of best fit and correlation coefficient

Classroom Considerations

• The class should know how to create a scatter plot
• Plotted points are accurate to the thousandths place

• This resource is only available on an unencrypted HTTP website.It should be fine for general use, but don’t use it to share any personally identifiable information

Pros

• Provides directions to how to use the interactive
• Displays residuals in both a table and a graph

Cons

• None

Common Core

HSS-ID.B.6.a HSS-ID.B.6.b HSS-ID.B.6.c HSS-ID.C.7 HSS-ID.C.8