Scatter plots are used in order to compare two variables and see if they have any correlation with each other. In this example the two variables compared were arm strength and grip strength. Many times on scatter plots a 45 degree angle will be drawn on the graph and the less the dots move away from the dots then the more likely the two variables are dependent on each other. In this case it was determined that the more grip strength a person has, the more arm strength they will have as well.
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