A graph can be thought of as a "picture" of data. Graphs are useful because they can reveal patterns or trends and can be used to make predictions. You can analyze and evaluate data found in graphs to make predictions.

Let's look at an example of using data to reveal patterns or trends and make predictions.

A student conducted an experiment to determine if the temperature of the water affected the breathing rate of the freshwater sunfish. Temperature was measured in degrees Celsius and breathing rate was per minute. The data table and graph below show the data that was collected. Notice some of the data in the data table is missing.