Step 3: Draw bars corresponding to each category. Here, we are drawing a vertical bar graph, so we will place the categorical data on the x-axis and the numerical values on the y-axis. Step 2: Label the horizontal and vertical axes to describe the information. For smaller values, we simply go with the counting sequence 1, 2, 3… but for larger values, we can also pick a counting sequence with some interval of numbers between each value. The scale refers to the counting sequence we will place on the axis. Step 1: Decide the scale and interval for your numerical values. Let’s try representing the given data on a graph. The key explains which set of data is shown by the graph.įor example, in the above graph, the blue bar represents the number of students in Class A that prefer a particular fruit, the orange bar represents the number of students in Class B, and the green bar represents the number of students in Class C that prefer a particular fruit. Each set of data is graphed separately but on the same graph. Grouped: This graph represents related sets of data. The data categories are placed on the horizontal axis, and the numerical values are placed on the graph’s vertical axis. Vertical: Here, the bars are drawn vertically from down to top. The data categories are placed on the vertical axis and numerical values are placed on the graph’s horizontal axis. Horizontal: Here, the bars are drawn horizontally from left to right. The height or length of each bar relates directly to its value.It can be either horizontal or vertical.The gap between one bar and another should be uniform throughout.A bar graph is the representation of numerical data by rectangles (or bars) of equal width and varying height.
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