What are Bar graphs Good for? Definition and Examples
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Bar graphs, additionally known as bar charts, examine values between categorical knowledge over a time period by utilizing rectangular bars. Bar charts is likely to be little simpler to create than another sorts of graphs which may take a very long time to assemble. The determine under exhibits a bar graph.
The knowledge displayed within the bar graph above is easy. It tells what number of days of snow there have been through the month of December, January, February, and March.
For instance, in December there have been two days of snow and in February there have been fourteen days of snow.
If the bar doesn’t prolong to the following line on the dimensions, simply approximate the worth.
For the month of March, the bar doesn’t prolong all the way in which to 4. Nevertheless, a detailed look exhibits that the bar is between 4 and a couple of. Due to this fact, an excellent approximation is 3, or 3 days of snow in March.
Components of a bar graph
A bar graph has the next 5 components
- Title
- Classes
- Scale
- Labels
- Rectangular bars
The title tells what the bar graph is about. For instance, the title of the bar graph above is “Days of Snow“
The classes present the specific knowledge that you’re attempting to match. For instance, December, January, February, and March are the totally different classes you are attempting to match. Every class, similar to January, is a categorical variable. Classes are normally displayed on the x-axis.
The scale exhibits the quantities for the classes and the interval that’s used to match the classes. The dimensions is normally displayed on the y-axis.
There are two totally different labels on a bar graph, one for the classes and one other one for the dimensions. The one for the classes tells you what the classes are about and the one for the dimensions exhibits what’s being counted. For instance, the label used for the classes is “Month” and the label used for the dimensions is “Variety of Days of Snow“
Lastly, we use rectangular bars of equal width to point out frequencies. The peak of the oblong bar represents the frequency of every class.
Forms of bar graphs
Listed below are the 4 several types of bar graphs:
- Vertical bar graph
- Horizontal bar graph
- Grouped bar graph (additionally known as a number of bar chart or clustered bar chart)
- Stacked bar graph
The vertical bar graph is the commonest kind of bar graph. It’s the one that you simply see within the determine above.
Horizontal bar graphs
The bars don’t have to be vertical. Info will be displayed as nicely with horizontal bar graphs as proven under. In a horizontal bar graph, the totally different classes are displayed on the y-axis whereas the dimensions is displayed on the x-axis.
Grouped bar graphs
When every class can have multiple worth, you might use a grouped bar graph to show the info. The grouped bar graph under exhibits the mathematics scores for 4 college students within the eighth grade. Discover {that a} grouped bar graph features a key on the backside of the graph and totally different colours to signify the totally different values in every class.
For instance, the pink bar graph is the rating on the ultimate examination. Eric obtained a 60 on the ultimate examination.
Stacked bar graph
The stacked bar graph is much like the grouped bar graph since every class also can have multiple worth. Nevertheless, with a stacked bar graph, similar to the identify implies, the values are stacked on prime of one another.
Within the graph under, the class known as “Summer season” has 3 values stacked on prime of every and the amount of cash the household spent through the summer season on Restaurant/Ice cream is 1200 {dollars}.
Tips on how to learn data on bar graphs
Instance:
Use the bar graph under to reply the next questions:
- What’s the scale of the bar graph?
- What’s the title of the graph?
- What number of scholar scored 80?
- What number of college students obtained 60 on the check?
- What number of college students took the check?
- Why is there no bar above 100?
- If the passing grade is 70, what number of college students handed?
Solutions
a. The dimensions is on the left of the graph and the dimensions goes from 1 to 7 with an interval of 1.
b. The title is “rating on a primary math check”
c. 6 college students rating 80
d. 4 college students obtained 60
e. 1 scholar obtained 40, 2 college students obtained 50, 4 college students obtained 60, 3 college students obtained 70, 6 college students obtained 80, and 2 college students obtained 90
1 + 2 + 4 + 3 + 6 + 2 = 18
So, 18 college students took the check.
f. There isn’t a bar above 100 as a result of nobody obtained 100 on the check.
g.
3 college students obtained 70, 6 college students obtained 80, and 2 college students obtained 90
3 + 6 + 2 = 11. So 11 college students handed the check.
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