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**Answer**

The Correlation coefficients measures how strong a relationship is between two variables.

**The Pearson's Correlation Coefficient formula is:**

$r=\frac{{\displaystyle \sum _{}}({x}_{i}-{\displaystyle \stackrel{-}{x}})({y}_{i}-\stackrel{-}{y})}{\sqrt{\sum _{}{({x}_{i}-\stackrel{-}{x})}^{2}\sum _{}{({y}_{i}-\stackrel{-}{y})}^{2}}}$

where;

$r-isthecorrelationcoefficient$

${x}_{i}-isthevaluesofthex-variableinasample$

$\stackrel{-}{x}-isthemeanofthevaluesofthex-variable$

${y}_{i}-isthevaluesofthey-variableinasample$

$\stackrel{-}{y}-isthemeanofthevaluesofthey-variable$

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