Dot Chart or Marker Chart displays values of two variables in the form of dots in the Cartesian coordinate system.
Dot Charts are used to show the presence or absence of a relationship between two variables. Markers corresponding to different types of phenomena can be depicted with different colors.
A measure of the relationship between two variables is called correlation. If it is possible to draw a (nearly) straight line between the markers on a Dot Chart, the correlation between the variables is considered to be high (or strong). If the markers are distributed evenly, then the correlation is low or might equal zero.
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