Final answer:
The correlation coefficient is the statistic that indicates the strength of the association between net cash flow and sales, with values closer to -1 or +1 representing a stronger relationship.
Step-by-step explanation:
The strength of the association between net cash flow and sales is indicated by the correlation coefficient. The correlation coefficient is a statistical measure that describes the extent to which two variables are linearly related. It helps in determining the direction and strength of the relationship between variables.
Regarding the value of the correlation coefficient:
A value closer to -1 or +1 indicates a stronger association (either negative or positive respectively).
A value around 0 indicates a weaker association.
The other options such as standard error, standard deviation, and mean absolute deviation are measures of variability or precision within a set of values, but they do not directly indicate the strength of the relationship between two variables like the correlation coefficient does.