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Question: The formulas for a and b of the regression line y′ = a + bx are



A ) II only
B ) III only
C ) IV only
D ) I only

Steps to derive

1 The formulas for a and b of the regression line y′ = a + bx are
a = (Σy)(Σx2)-(Σx)(Σxy)n(Σx2)-(Σx)2
b = n(Σxy)-(Σx)(Σy)n(Σx2)-(Σx)2
where a is the y′ - intercept and b is the slope.



Hence the right answer is Option D

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