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What are correlational statistics? Name the most common one and describe the meaning of the numbers...

What are correlational statistics? Name the most common one and describe the meaning of the numbers that are related to this statistic

Math   Statistics-And-Probability   
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Correlational statistics is a statistical relation between two or more variables such that a change in the value of one variable are accompanied by a changes in the other. The use of statistical correlation is to evaluate the strength of the relations between variables.

The most commonly used correlation measure is Pearson correlation coefficient.

The value of correlation coefficient varies between -1 to +1 . A value of +1 or -1 indicates a perfect degree of association between two variables. As the value of correlation coefficient tends towards 0,the relationship between variables will be weaker.

A + sign indicates a positive relationship and a - sign indicates a negative relationship between two variables.

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