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State the two normal equations used in fitting a straight line.

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State the two normal equations used in fitting a straight line.

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The normal equations used in fitting a straight line are ΣY = na + b ΣX and ΣXY = a ΣX + b ΣX2 

Where n = number of years given in the data, 

X = time 

Y = actual value 

a, b = constants

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