To compare you find characteristics that are common to both.
To contrast you list characteristics that are present in one but not in the other.
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graphs are to compare and contrast data
frequency table
First, you need a frequency table.
The frequency in a frequency table is the number of occurrences within each class width. The total frequency is the sum of all frequency's within all the classes.
How is a frequency table different from a line plot how are they similar? Read more: