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a group of points positioned or occurring closely together

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An action or occurrence that can cause another. The result of an action is always predictable, providing a clear relation between them which can be established with certainty.

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A correlation is stronger the closer the points are located to one another on the line.

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Two variables x and y are related statistically when  the value of the second variable can be approximately estimated when the first is known.

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a plot situated away or detached from the main group

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A line indicating the general course or tendency of something

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If the linear correlation coefficient takes values close to 0, the correlation is weak.
A correlation is weaker the farther apart the points are located to one another on the line.

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line of fit is flat.In this case, a change in X has no impact on Y (and vice-versa). There is no relationship between the two variables.

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Is a relationship between two variables such as the value of one variable increases, the other decreases.

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A mutual relationship between two or more things.

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http://www.investopedia.com/terms/p/positive-correlation.asp

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A positive correlation exists between variable X and variable Y if an increase in X results in an increase in Y (and vice-versa).

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A graph of two values made up of variables are plotted along two axes, the pattern of the points revealing any correlation present.

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Facts and statistics collected together for reference or analysis.