Identify the true statements about the correlation coefficient,  ?. A correlation coefficient of zero means that no relationship exists between the two variables. If two variables are positively correlated, when one variable increases, the other variable decreases. The value of  ? ranges from negative one to positive one. The sign of  ? describes the direction of the association between two variables. The correlation coefficient is not affected by outliers. When the data points in a scatter plot fall closely around a straight line that is either increasing or decreasing, the correlation between the two variables is strong.

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