Red and yellow creates orange. Yellow and blue creates green. The secondary colors can be mixed further to create additional shades. Tertiary colors are the result of a primary and secondary color mixed together. For example, orange mixed with red creates red-orange.
An influential point is an outlier that greatly affects the slope of the regression line. One way to test the influence of an outlier is to compute the regression equation with and without the outlier. This type of analysis is illustrated below.
Clusters, Gaps, and Outliers A cluster is formed when several data points lie in a small interval. A gap is an interval that contains no data. An outlier has a value that is much greater than or much less than other data in the set. An outlier may significantly affect the mean of a data set.