Appendix Chapter 1. WORKING WITH GRAPHS. 1. Positive and Negative Relationships. Graphs reveal a positive or negative relationship.
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A scatter diagram plots the values of one variable against the values of another for a specific time interval.
If the dots show a pattern of low prices andhigh usage but high prices and low usage, the scatter diagram suggest a negative relationship, indicating by a general declining pattern of dots from left to right.
A general rising pattern of dots from left to right shows a positive relationship.
If there were no relationship, the dots would be randomly.