Pictorial Representation of Data - Double Bar Graph

How to Make a Double Bar Graph

Since humanity flourished and the population increased, so did the amount of trade and transactions in the world. The merchants found it even harder to keep a track of the money that was flowing in and out of their coffers. When the population was lesser, trade was much simple but keeping a track of who owes whom how much amount of money, so on and so forth was extremely tedious. To end this, the merchants created a bar graph with the help of which they are able to depict a huge variety of the information pictorially that not only helped with the understanding but also made it much easier for the merchant. In this article, you will learn in detail the pictorial representation of data using a double bar graph, how to make a double bar graph, look at some double bar graph questions, and learn about the use of a double bar graph. 

What is a Double Bar Graph

Double bar graphs are also referred to as the double bar charts that help you in comparing or presenting more than one type of information, events, or situations, instead of just one by using bars.


Given below is a double bar chart. Take a close look at it and study it carefully so that you become familiar with its features.


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Once you have examined the double bar chart above, there are a few good observations that you can make from the graph:

  1. The scale is situated on the left side of the graph and is of 10 units.

  2. The title of the graph is "Scores on a Fractions Test with or without Preparation".

  3. Preparation helped the students to score higher points.

  4. The lowest score without the preparation is 45 and the highest score is that of 85.

  5. The lowest score with the preparation is 55 and the highest score is that of 100.

  6. The students that made the most improvement include Darline, Carla, ohn. Their score was improved by 15.

  7. The student that made the least improvement is named Peter. Although Jetser's score is still low, he has improved by 10 points while Peter’s score was improved just by 5 points

How to Make Double Bar Graph on Graph Paper

The following are the steps to make a double bar graph on a graph paper.

  1. Decide what title you would give to the graph

  2. Decide if you want the horizontal or the vertical bars

  3. Then choose a scale

  4. Put the appropriate labels on both the axes

  5. Lastly, draw the bars


Consider the following example:

Use The Table Given Below to Construct a Double Bar Chart

Scores on The Practice Test and The Test

Students 

Practice Test

Test

Jeff

60

70

Peter

75

90

John

55

55

Mary

80

95



  1. You can clearly see the title from the given table.

  2. You need to choose vertical bars

  3. Since the scores differ from each another mostly by the range of 5, 10, 15, or 20, it makes sense to choose the scale of 10

  4. You need to put names on the x-axis and the scores on the y-axis. If you had decided to make horizontal bars, you would have to put the names on the y axis and the scores on the x axis

  5. Finally, you need to draw bars. The double bar graph is shown as follows:


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Double Bar Graph Examples

Let us now take a look at some of the double bar graph examples.

Example 1


What Is The Favorite Sport of The Girls?


Solution:


  1. First, you need to look for the highest bar in the graph that is pink. This bar color represents the favourite sports of girls.

  2. Next, take a look at the x-axis to see which data is represented by that specific bar.

  3. Then, you need to double-check that the y-axis amount is the highest amount of any given favorite sport among the girls. In this case, soccer is the favorite sport since 10 girls are choosing it, that is also the highest amount on the given graph for the favorite sports of the girls

Hence, your answer is soccer.


Example 2


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Which Sport is Liked Equally by Both the Boys and The Girls?


Solution


First, you need to understand the question by realizing that you are looking for two bars which are representing an equal amount of data.


Next, you need to find the two bars on the given graph which line up equally with each other. Both the blue and the pink will be at the same height on the given graph.


Then, you must look at the x-axis for determining which sport is represented by the equal amount of data among the boys and the girls.


Hence, your answer is baseball.

FAQ (Frequently Asked Questions)

1. What is a double bar graph?

A double bar graph is used for displaying two sets of the given data on the same graph. For example, if you want to show the number of hours which students worked in one month compared to the other month, you would need to use a double bar graph. The information in the double bar graph is related to each other and it compares one set of data to the other.


2. How to make a double bar graph?

A double bar graph is to be made in the same way in which a single bar graph is made except for the fact that instead of just one bar of the data there will be two bars of the given data. Given below are the steps involved:


  1. Draw in both the axes, one with items that are being counted (x-axis) and the other with the scale which is going to be used for counting (y-axis).

  2. Decide on the best scale to be used for given the data.

  3. Draw in the bars and represent the data.

  4. Draw one category of the data in one color and the other category in the other color.