Final answer:
When scatter plot points are too close, there are two methods to identify potential outliers: visually enlarging or zooming in on the graph, and calculating residuals and comparing them to twice the standard deviation.
Step-by-step explanation:
When the scatter plot points are too close together, it can be difficult to determine if a point is between or outside the lines used to flag outliers.
One approach is to visually enlarge or zoom in on the graph to get a clearer view.
Another method is to calculate the residuals and compare them to twice the standard deviation. If a data point's residual is at least 2s, it can be considered a potential outlier.