LINE PLOT

created by: Jennifer Nord

One type of graph is a line plot. A line plot provides an easy way to organize data. They are usually used when there is one group of data, and fewer than 50 values.

A line plot consists of a horizontal number line, on which each value of a set is denoted by an x over the corresponding value on the number line. The number of x's above each score indicates how many times each score occurred.

Suppose thirty people live in an apartment building. These are the following ages:

58, 30, 37, 36, 34, 49, 35, 40, 47, 47, 39, 54, 47, 48, 54, 50, 35, 40, 38, 47, 48, 34, 40, 46, 49, 47, 35, 48, 47, 46

Your first step should be: placing the values in numerical order.

30, 34, 34, 35, 35, 35, 36, 37, 38, 39, 40, 40, 40, 46, 46, 47, 47, 47, 47, 47, 47, 48, 48, 48, 49, 49, 50, 54, 54, 58

Now create your graph.

This graph shows all the ages of the people who live in the apartment building. It shows the youngest person is 30, and the oldest is 58. Most people in the building are over 46 years of age. The most common age is 47.

Line plots allow several features of the data to become more obvious. For example, outliers, clusters, and gaps are apparent.

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If you have any comments send me a line: jnord@nmu.edu

Last update: December 10, 1995.