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A histogram is a graph that uses bars to show the distribution of a data set. Unlike a bar chart, which has a qualitative variable on the x-axis, a histogram can help you to visualize numerical or quantitative data and identify any patterns.
A qualitative variable is a category that can only be expressed in words. But if you have quantitative variables on both the x- and y-axis–and there’s no space in between the bars–then you’re probably looking at a histogram.
Making a histogram
Consider this example: a conductor of an orchestra wants to make a graph which reflects the age range of his band members. They range in age from 15 to 40 years old.
Keep in mind that if you have any qualitative variables (that can only be expressed in words), it’s best to use a bar chart or pie chart instead.
If you're making your own histogram, here are three things to remember:
In the next lesson, we’ll turn this histogram into a frequency polygon.
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