Why we cannot use frequency polygon as Scatter plot? - Week 4 : Histograms

Why we cannot use frequency polygon as Scatter plot?

Frequency polygon maps the values of a random variable to its frequency. Its purpose is to find frequency of the values of a single variable.
Where as,
Scatterplot maps individual values of 2 or more variables. Its purpose is to find correlation between 2 variables.

Since their purpose are different they can not therefore be used interchangeably.

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