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Regression - Steps to fit a line using Least Squares

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Can someone explain the steps to fit a line using least squares relying on technology for the computationally intense learning for middle grades students and the same for high school students which would be led through the technology, the hand computation, or both.

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The expert provides the steps to fit a line using least squares regression analysis. A complete, neat and step-by-step solution is provided in the attached Excel file.

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