Inference - means that you understand what is meant even when it is not actually stated. You use clues to understand what is not said. Key - is used to explain the value of the picture symbols. Vertical Axis - lines running from top to bottom on a graph. Horizontal Axis - lines running left to right on the left side of a graph.
All graphs have information that is given.
Graphs are used to give a quick impression of a great deal of data, making it easy to make comparisons and draw conclusions. Many of the conclusions are drawn through inference. A key is used to show the value of each symbol. Pictographs are read by counting the symbols on the line of a graph and computing their value. It is draw using values along a horizontal and a vertical axis.