Boxplot menu selection

step  To visually scan the z scores and find unusual values, from the menus choose:

Graphs
  Boxplot...

step  Select Summaries of separate variables.

step  Click Define.

step  Select Zscore: Log-long distance through Zscore: Log-wireless as the variables the boxes represent.

step  Click Options.

step  Select Exclude cases variable by variable.

step  Click Continue.

step  Click OK in the Define Simple Boxplot dialog box.

Boxplots of the z scores show that customer 567 spent much more than the average customer on toll-free service last month. This should account for the larger skewness and kurtosis observed in Toll free last month.