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Correlation — Economics STD 11 Commerce — Question

CBSE BoardEnglish MediumSTD 11 CommerceEconomicsCorrelation3 Marks
Question
Define the variables of the given formula, $\text{r}=\frac{\sum\text{xy}}{\text{n}.\sigma_\text{x}.\sigma_\text{y}}$
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Answer

the given formula, r = Coefficient of correlation$\sum\text{xy}$ = Sum of products of deviations of X from $\overline{\text{X}}$ and of Y from $\overline{\text{Y}}$
n = Number of pairs of items$\sigma_\text{x}$ = Standard deviation of X
$\sigma_\text{y}$= Standard deviation of Y.

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