Quantitative association rules may disclose exceptional behaviors within a data set, where "exceptional" can be defined based on statistical theory. For example, Section 7.2.3 shows the association rule
which suggests an exceptional pattern. The rule states that the average wage for females is only $7.90 per hour, which is a significantly lower wage than the overall average of $9.02 per hour. Discuss how such quantitative rules can be discovered systematically and efficiently in large data sets with quantitative attributes.