Which of the Following Formula Is Used to Compute Covariance $\frac { \sum _ { i = 1 } ^ { N } \left( x _ { i } - \mu _ { x } \right) \left( y _ { i } - \mu _ { y } \right) } { N }$

question 48

Multiple Choice

Which of the following formula is used to compute covariance between two variables X and Y?

• A)cov (X,Y)= \(\frac { \sum _ { i = 1 } ^ { N } \left( x _ { i } - \mu _ { x } \right) \left( y _ { i } - \mu _ { y } \right) } { N }\)
• B)cov (X,Y)= \(\frac { \sum _ { i = 1 } ^ { N } \left( x _ { i } - \mu _ { x } \right) ^ { 2 } } { N }\)
• C)cov (X,Y)= \(\sum_{i=1}^{N} \frac{\left(x_{i}-\mu_{x}\right)^{2}}{y_{i}-\mu_{y}}\)
• D)cov (X,Y)= \(\frac{\sum_{i=1}^{N}\left(x_{i}-\mu_{x}\right)^{2}}{N^{2}}\)

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