True or False: A confidence percent of 25% in an association set would be considered too low to be of any use.

• A. Sometimes
• B. True
• C. False
• D. Not Applicable

Answer: (B)

In association rule mining, confidence tells you how often the rule’s consequent happens when its antecedent occurs. A confidence of 25% means the rule holds only one out of four times, which is too weak to rely on for making predictions or decisions. Practically, you usually set a minimum confidence threshold well above this (often around 60–80%), so rules are reliable enough to act on. Additionally, if the consequent occurs in about 25% of all transactions anyway, the rule doesn’t provide any predictive gain over the baseline. For these reasons, a 25% confidence is generally considered too low to be of any use.