How would you interpret a correlation coefficient of -1?

A correlation coefficient of -1 signifies a perfect negative correlation between two variables. This means that as one variable increases, the other variable decreases in a perfectly predictable manner. In practical terms, if you were to plot these two variables on a graph, they would form a straight line that slopes downward from left to right. This type of correlation indicates a strong and consistent inverse relationship between the two variables, where changes in one variable can be precisely matched by changes in the opposite direction in the other variable.

In the context of data analysis, recognizing a perfect negative correlation is crucial because it provides insights into the relationship dynamics at play, allowing for more accurate modeling and predictions in various fields including healthcare statistics. Understanding this relationship can be fundamental in making informed decisions based on historical data trends.