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?

1) a linear scatter plot relationship between Y and X with strong positive or negative slope

2) a perfectly vertical scatter plot relationship between Y and X

3) a perfectly horizontal scatter plot relationship between Y and X

4) a normal distribution relationship between Y and X

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