Question: In determining the best variables to choose for a linear regression model scatter plots can be used. What is an indicator of a good independent

In determining the best variables to choose for a linear regression model scatter plots can be used. What is an indicator of a good independent variable candidate for regression analysis?

A relationship between Y and X that is perfectly horizontal

A relationship between Y and X that is perfectly vertical

A linear relationship between Y and X with positive or negative slope

A normal relationship between Y and X

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