Final answer:
The correlation between two variables can be positive, negative, or zero. A positive correlation means that the variables move in the same direction, a negative correlation means they move in opposite directions, and a zero correlation means there is no relationship between the variables.
Step-by-step explanation:
The correlation between two variables can be positive, negative, or zero. A positive correlation means that the variables move in the same direction, so when one variable increases, the other also increases. A negative correlation means that the variables move in opposite directions, so when one variable increases, the other decreases. A correlation of zero means that there is no relationship between the variables, and changes in one variable do not affect the other.