A study of 800 marketers from Fortune 1000 companies reveals that most marketers overly rely on intuition rather than data, and those who do use data generally do so ineffectively. Effective marketers should focus on higher-order goals, maintain comfort with ambiguity, and ask strategic questions based on data. Recommendations for managers include emphasizing critical business goals, integrating data into decision-making, and educating marketers about common data interpretation errors.