What is a histogram?

A histogram is a graph that you can use to assess the shape and spread of continuous sample data. You might create a histogram before or during an analysis to help confirm assumptions and guide additional analyses.

To draw a histogram, Minitab divides sample values into intervals called bins. By default, each bar on the histogram represents the number of observations falling within a bin (the frequency). Minitab automatically determines an optimal number of bins, but you can edit the number of bins in addition to the intervals covered by each.

In this histogram, there is one observation between 0 and 12, four observations between 12 and 16, and so on.

A histogram can help you answer the following questions:
Normal
Left-skewed
Shape

Do the data appear to be normally distributed? Do the data skew left or right?

Tightly-clustered
Within the limits
Spread

Are the data tightly clustered about a certain value? Do the data remain within set limits?

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