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State the formula of Karl Pearson’s co – effecient of correlation upgrouped data?

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State the formula of Karl Pearson’s co – effecient of correlation upgrouped data?

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1. Direct Method:

(I)

(II) Assumed Mean Deviation Method:

2. Indirect Method:

dx = (X –x ) and dy = (Y –y )

r is free from origin r is free from unit of measurement -1 ≤ r ≤ + 1

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