Question

Khanacademy notes on on statistics and probability exploring bivariate numerical data

Answer 1

Heya....
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U can easily get them from the website of khan Academy....
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Answer 2

So if our regression equation is Y = 10 + 2X, we can compute the predicted value of Y by substituting any value of X into the equation. If X = 5, then the predicted value of Y is 10 + (2)(5) or 20. It turns out that minimizing the sum of the error terms doesn’t work since positive error will cancel out negative error so we minimize the sum of the squared error terms