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If the plotted points lie on a straight line parallel to the X-axis of a scatter diagram, it shows :

If the plotted points lie on a straight line parallel to the X-axis of a scatter diagram, it shows : Correct Answer Absence of correlation

The correct answer is Absence of correlation

Key Points

  • If the plotted points lie on a straight line parallel to the x-axis or in a haphazard manner, it shows absence of any relationship between the variables.
  • The simplest device for ascertaining whether two variables are related is to prepare a dot chart called scatter diagram.
  • When this method is used the given data are plotted on a graph paper in the form of dots, i.e., for each pair of X and Y values we put a dot and thus obtain as many points as the number of observations.
  • By looking to the scatter of the various points we can form an idea as to whether the variables are related or not.

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