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Chapter 2.4

Chapter 2.4. Paired Data and S catter Plots. Scatter Plots. A scatter plot is a graph of ordered pairs of data values that is used to determine if a relationship exists between the two variables. Scatter Plot Correlations . Analyzing Scatter Plots.

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Chapter 2.4

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  1. Chapter 2.4 Paired Data and Scatter Plots

  2. Scatter Plots • A scatter plot is a graph of ordered pairs of data values that is used to determine if a relationship exists between the two variables.

  3. Scatter Plot Correlations

  4. Analyzing Scatter Plots • A positive linear relationship exists when the points fall approximately in an ascending line. Both x and y values are increasing. • A negative linear relationship exists when points fall approximately in a descending line. As x values increase, y values decrease. • A nonlinear relationship exists when points fall in a curve • No relationship exists when there is no discernable pattern of the points

  5. Create a Scatter Plot: A researcher is interested in determining if there is a relationship between the number of accidents and the number of fatalities when the roads are wet. The data below is f a 10 year period. Draw a scatter plot for the data and comment on the nature of the relationship.

  6. Scatter Plot – accidents vs. fatalities

  7. Try It! • Pg. 96 #1-4

  8. Scatter Plots and Technology • Make a scatter plot on your calculator • Pg. 99

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