Follow the link to the Pre-Assessment for Scatter Plots. This will give you an idea of what you already know about Scatter Plots. You may work on the Pre-Assessment util you get 5 correct answers or until you have worked for 5 minutes.
This video will introduce you to the concept of Scatter Plots. You should also practice what you know about the concept using the quiz found to the right of the video on the same web page.
Below is a picture to help you better understand the idea of correlation. We will focus on Positive, Negative, and No Correlation.