There are times when there is no logic in doing so.
For example, suppose you had a graph of the heights and weights of a class of students. Each data point would be an ordered pair representing the height and weight of a particular student. What, if anything, would a line connecting one student to the next represent?
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If you had a formula you would plug numbers in for the variables and solve for the other variables create a list of coordinates (data points). Next you would graph those points and connect the dots.
If the variables are something continuous, then you should connect the points. For example, if it is your height and weight then since those variables are continuous it is necessary to connect the points plotted on the coordinate graph.
that depends on what you are trying to do
(it makes sense to connect the points on a graph wen there is movement....or so u can see it more cearly)--BreeBree..... hope i helped!! OR you could connect the points when it is a continuous thing.
A scatter plot would be best for non-related data points. A line graph would be best for related data points.