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.
The reason that an outlier differs from the rest of the points in the data set is crucial in determining whether to omit the outlier or not. Generally, outliers that can be attributed to an error of some sort-an error in measurement, recording, or experimental design, for instance-are omitted.