Which of the following is not one of the categories of data mining methods?

1. Clustering
2. Recommendation
3. Association
4. Prediction

The ultimate goal of Total Quality Management is

1. High quality product
2. cost saving
3. customer satisfaction
4. profit maximaization.

The Coefficient of Variation

1. measures absolute variation regardless of mean value
2. can be used to compare the central tendency of two or more sets of data measured in different units
3. indicates that the larger coefficient of variation means less relative variability
4. is the reciprocal of RTRR(Return to risk ratio)