Logically, doing research on marketing research is one of the best ways to improve future marketing research techniques. Survey Monkey's Hackathon data mining project to find algorithims regarding wether questions are good or bad.
The results? People like saying yes. People like agreeing more than dissagreeing. In general, people will pick a more positive answer wether or not it is true.
This studies findings may change how research questions are worded in the future to prevent significant positive skew.