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Sometimes when we graph the relationship between two varying quantities of real life on a coordinate plane we get dots scattered on coordinate plane.

For example graph average math score of students from grade 8.

Let's consider their 8-week score.

(1, 50) (2, 52), (3, 49), (4, 58), (5, 60), (6, 65), (7, 64), (8, 68).

If you plot these coordinates you will get the points scattered points.

1) It is helpful to study the relationship between two varying quantities.

2) It says whether the relation is positive or negative. Sometimes we may not have any relation.

3) Such relation is called as correlation.

4) In the above example the graph has positive correlation. As the week increases the average scores also increases. There may be some down fall. Overall, it is a positive variation.

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