Chapter 2.4 Paired Data and Scatter Plots. Scatter Plots A scatter plot is a graph of ordered pairs of data values that is used to determine if a relationship.

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Presentation transcript:

Chapter 2.4 Paired Data and Scatter 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 1.A positive linear relationship exists when the points fall approximately in an ascending line. Both x and y values are increasing. 2.A negative linear relationship exists when points fall approximately in a descending line. As x values increase, y values decrease. 3.A nonlinear relationship exists when points fall in a curve 4.No relationship exists when there is no discernable pattern of the points

Number of Accident s Number of Fatalitie s 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.

Scatter Plot – accidents vs. fatalities

Try It! Pg. 96 #1-4

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

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