In data mining, finding an affinity of two products to be commonly together in a shopping cart is known as *

association rule mining.

cluster analysis.

decision trees.

artificial neural networks.

In estimating the accuracy of data mining (or other) classification models, the true positive rate is *

the ratio of correctly classified positives divided by the total positive count.

the ratio of correctly classified negatives divided by the total negative count.

the ratio of correctly classified positives divided by the sum of correctly classified positives and incorrectly classified positives.

the ratio of correctly classified positives divided by the sum of correctly classified positives and incorrectly classified negatives.

Common sources of traffic to your Web site include all of the following EXCEPT *

paid search from search engines.

referral Web sites.

accidental visitors.

direct links.

In general, what is the best kind of Web traffic to a Web site? *

European Web traffic

paid Web traffic

bot-generated traffic

organic Web traffic