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A series of mathematical equations is written in red marker on a white surface. The first equation is C = α + β₀Y + ε. Then, ε² = (C - α - β₀Y)². The following lines show the development of these equations, including intermediate steps involving summation notation (Σ), means (indicated by overlines), and combinations of variables like C, Y, α, and β₀. The last equation presented is β₀ = (Σ(C-C)(Y-Ȳ)) / (Σ(Y-Ȳ)²).
FM-VrsF83

Feb 10, 2026

San Andrés Cholula, Mexico

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A series of mathematical equations is written in red marker on a white surface. The first equation is C = α + β₀Y + ε. Then, ε² = (C - α - β₀Y)². The following lines show the development of these equations, including intermediate steps involving summation notation (Σ), means (indicated by overlines), and combinations of variables like C, Y, α, and β₀. The last equation presented is β₀ = (Σ(C-C)(Y-Ȳ)) / (Σ(Y-Ȳ)²).

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FM-VrsF83

Feb 10, 2026

San Andrés Cholula, Mexico

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