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Investigating Scatter Plots. Section 2.5. Investigating Scatter Plots. Investigating Scatter Plots. Scatter plots are similar to line graphs in that each graph uses the horizontal ( x ) axis and vertical ( y ) axis to plot data points.

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Investigating Scatter Plots

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Investigating scatter plots

Investigating Scatter Plots

Section 2.5

Investigating scatter plots1

Investigating Scatter Plots

Investigating scatter plots2

Investigating Scatter Plots

  • Scatter plots are similar to line graphs in that each graph uses the horizontal ( x ) axis and vertical ( y ) axis to plot data points.

  • Scatter plots are most often used to show correlations or relationships among data.

Investigating scatter plots3

Investigating Scatter Plots

  • Positive correlations occur when two variables or values move in the same direction.

    • As the number of hours that you study increases your overall class grade increases

Investigating scatter plots positive correlation

Investigating Scatter Plots – Positive Correlation

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Investigating Scatter Plots

  • Negative Correlations occur when variables move in opposite directions

    • As the number of days per month that you exercise increases your actual weight decreases

Investigating scatter plots negative correlation

Investigating Scatter Plots – Negative Correlation

Investigating scatter plots5

Investigating Scatter Plots

  • No correlation exists if there is no noticeable pattern in the data

    • There is no relationship between the number of shirts someone owns and their annual salary

Investigating scatter plots no correlation

Investigating Scatter Plots – No Correlation

Line of best fit

Line of Best Fit

  • A line of best fit is a line that best represents the data on a scatter plot.

  • A line of best fit may also be called a trend line since it shows us the trend of the data

    • The line may pass through some of the points, none of the points, or all of the points.

    • The purpose of the line of best fit is to show the overall trend or pattern in the data and to allow the reader to make predictions about future trends in the data.

Use the data to create a scatter plot

Use the data to create a scatter plot

Scatter plot of the data

Scatter Plot of the Data

Things to remember

Things to remember

  • A scatter plot with a positive correlation has X and Y values that rise together.

  • A scatter plot with a negative correlation has X values that rise as Y values decrease

  • A scatter plot with no correlation has no visible relationship

  • The line of best fit is the line that best shows the trend of the data

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