Which of the following is an example of a positive correlation?
a) The crime rate increases as the income level decreases.
b) As education levels decrease, the crime rates increase.
c) The crime rate decreases as city population decreases.
d) None of the above.
I don't think any of them are correct. Is my answer correct?
With a positive correlation, both variables increase/decrease together.
Yes, your answer is correct. None of the options provided exemplify a positive correlation. In a positive correlation, as one variable increases, the other variable also increases. Conversely, as one variable decreases, the other variable also decreases.
In option (a), the crime rate is increasing as the income level decreases, demonstrating a negative correlation. In option (b), education levels decreasing is associated with an increase in crime rates, indicating a negative correlation as well. In option (c), the crime rate decreasing as city population decreases shows a negative correlation too.
Therefore, the correct answer is (d) None of the above.