Studying Scatter Plots

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Studying Scatter Plots
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Create a graph of this data
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Create a graph of this data
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Create a graph of this data
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Do all three graphs show the same type of
growth? What kind of growth is shown by each
No Correlation
Negative Correlation
Positive Correlation
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Draw a line that represents how the data is
changing.
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Use the line to predict what number matches up
with x 8. Use the line to predict what number
matches up with y 6.
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Draw a line that represents how the data is
changing.
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Use the line to predict the value that matches up
with x 2. Use the line to predict the value
that matches up with y 3.
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Is there a line that represents how this data is
changing?
We say that this line has no correlation.
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Writing Equations to Represent Data
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• When lines have positive or negative correlation
  you can write equations to represent the data.

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After the line is drawn, select two points on the
line and draw the right triangle that shows it
rise and run
Write a fraction for the steepness of the line.
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Predict where the line crosses the y-axis.
Write an equation for the line.
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After the line is drawn, select two points on the
line and draw the right triangle that shows it
rise and run
Write a fraction for the steepness of the line.
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Predict where the line crosses the y-axis.
Write an equation of the line.