Which of the following methods is least effective for understanding customer preferences in an AI system?

Using demographic data alone is least effective for understanding customer preferences in an AI system because it provides a limited and often generalized view of customer behaviors and preferences. While demographic data, such as age, gender, and location, can offer some insights about broader trends, it does not capture the individual preferences and nuanced motivations that influence customer decisions.

In contrast, analyzing purchase history allows for a direct look at what customers are actually buying, providing concrete data on preferences and trends. Reviewing customer feedback and reviews gives qualitative insights into customer satisfaction and preferences based on their experiences. Monitoring social media interactions can reveal real-time opinions and feelings, reflecting changing preferences and trends. Each of these methods generates richer, more actionable insights than relying solely on demographic data.