To know what data is being presented in a graph, you need to carefully examine the axis labels, legends and title of the graph. The x-axis and y-axis values usually represent the measured variables, and the intervals between the values indicate the range of the data. The legend provides a key to the various lines or symbols in the graph, which represent different data points or categories. The title may also provide information on the purpose of the graph or what it is comparing. It is important to also look for any notes or acknowledgments that may explain the data source or any limitations in the data being presented.
