Which of the following correctly describes a strong positive correlation?

A strong positive correlation is represented by a correlation coefficient of 1. This means that as one variable increases, the other variable also increases in a perfectly linear relationship. A correlation coefficient of 1 indicates that the variables move together precisely: for every increase in one variable, there is a corresponding increase in the other variable at a constant rate.

In contrast, a correlation coefficient of 0 indicates no correlation between the variables, meaning that knowing the value of one variable provides no information about the other. A coefficient of -1 represents a strong negative correlation, where an increase in one variable results in a decrease in the other variable. A coefficient of 0.5 indicates a moderate positive correlation, but it does not signify the strong and perfect relationship that a coefficient of 1 does. Therefore, the correct answer reflects the highest level of positive correlation possible.