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নিচের কোন সূত্রটি শুদ্ধ (প্রচলিত চিহ্নে)?

A.

r = \frac{\sum_{i = 1}^{n} (x_{i} - \bar{x}) (y_{i} - \bar{y})}{\sqrt{\sum_{i = 1}^{n} (x_{i} - x) \sum_{i = 1}^{n} (y_{i} - y)^{2}}}

B.

r = \frac{\sum_{i = 1}^{n} (x_{i} - \bar{x}) \sum_{i = 1}^{n} (y_{i} - \bar{y})}{\sqrt{\sum_{i = 1}^{n} (x_{i} - x) \sum_{i = 1}^{n} (y_{i} - y)^{2}}}

C.

r = \frac{\sum_{i = 1}^{n} (x_{i} +) (y_{i} - \bar{y})}{\sqrt{\sum_{i = 1}^{n} (x_{i} - x) \sum_{i = 1}^{n} (y_{i} - y)^{2}}}

D.

r = \frac{\sum_{i = 1}^{n} (x_{i} - \bar{x}) (y_{i} - \bar{y})}{\sqrt{\sum_{i = 1}^{n} [(x_{i} - x) \sum_{i = 1}^{n} (y_{i} - y)]^{2}}}

E. কোনোটিই নয়

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সঠিক উত্তরঃ A.

r = \frac{\sum_{i = 1}^{n} (x_{i} - \bar{x}) (y_{i} - \bar{y})}{\sqrt{\sum_{i = 1}^{n} (x_{i} - x) \sum_{i = 1}^{n} (y_{i} - y)^{2}}}

Explanation: