A scatterplot is a type of mathematical diagram using Cartesian coordinates to display values for two variables for a set of data. This scatterplot displays the association between the size of a diamond (in carats) and its retail price (in Singapore dollars) for 48 observations. The scatterplot clearly indicates that there is a positive association between size and price.
Source:http://www.stat.yale.edu/Courses/1997-98/101/scatter.htm
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