Mafia: The Old Country is a great new single-player game with a fantastic setting and compelling story, but it could use a bit more open exploration between the on-rails missions.

A linear relationship (or linear association) is a statistical term used to describe the directly proportional relationship between a variable and a constant.

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Correlation coefficients can mean a positive, negative, or no relationship between two variables. Use correlation coefficients to help pick securities for your portfolio.