Question: Adding a linear trend line on a scatter plot is: a. Always a good idea because it shows the relationship between two variables. b. Sometimes

Adding a linear trend line on a scatter plot is: a. Always a good idea because it shows the relationship between two variables. b. Sometimes a good idea, such as when the scatterplot pattern appears to suggest that a linear relationship exists between two variables. c. Always a good idea because it shows whether or not a "true" relationship exists between the two variables. d. Never a good idea because the relationship between two variables is never linear

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