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The video squares the x-deviations to form the denominator of the least-squares slope formula. Squaring removes the sign of each deviation, ensuring that all contributions to the denominator are nonnegative and that the sum measures the total spread of the x-values around their mean.

Conditions: The x-deviations $x_i-\bar{x}$ have already been computed.; The goal is to calculate the denominator for the slope $b_1$.

The video squares the x-deviations to form the denominator of the least-squares slope formula. Squaring removes the sign of each deviation, ensuring that all contributions to the denominator are nonnegative and that the sum measures the total spread of the x-values around their mean.

Conditions: The x-deviations $x_i-\bar{x}$ have already been computed.; The goal is to calculate the denominator for the slope $b_1$.