Graphs Lesson

Graphs

Interpreting Bar Graphs, Dot Plots, Histograms, and Scatter Plots

Bar Graphs

Numerical values of variables that are represented by the height or length of lines or rectangles of equal width.

Dot Plots

A type of graphic display used to compare frequency counts within categories or groups.

Usually includes a form of number line to display the data.

Histogram

A graphical display where the data is grouped into ranges (such as "100 to 149", "150 to 199", etc), and then plotted as bars.

Usually best used with a large amount of data.

Scatter Plot

A graph of plotted points that show the relationship between two sets of data.

Line of Best Fit

Line of best fit refers to a line through a scatter plot of data points that best expresses the relationship between those points.

Look for Correlation

• Positive linear

• Negative linear

• Positive linear with 1 outlier

• Negative linear with 1 outlier

• None Linear