Student Performance Prediction Using Linear Regression

Which of the following best describes the purpose of linear regression?
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What does a high Mean Squared Error (MSE) value indicate about a regression model?
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What does the error term (ε) represent in the regression equation?
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In the regression equation Y = a + bX + ε, what does 'a' represent?
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Why is it important to evaluate a regression model on a testing dataset?
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