2.1

Stem-and-Leaf Graphs (Stemplots), Line Graphs, and Bar Graphs

Stem-and-Leaf Graphs

Comes from the field of exploratory data analysis

When the data sets are small.

A quick way to graph data and gives an exact picture of the data.

Divide each observation of data into a stem and a leaf.

The leaf consists of a final significant digit.

Write the stems in a vertical line from smallest to largest

Draw a vertical line to the right of the stems.

Write the leaves in increasing order next to their corresponding stem.

Line Graph

Is useful for specific data values

The x-axis consists of data values

The y-axis consists of frequency points.

Bar Graph

Consist of bars that are separated from each other.

They can be vertical or horizontal