The Internet site www.artofstat.com/webapps

.html has an Explore Linear Regression applet. To show the impact of an outlier, use the Draw Own option to put 10 points on the scatterplot that have a correlation close to +1, and then add a single point that changes the correlation to a negative value. Explain why this single observation has so much influence. Download the scatterplot and print it as part of your solution.