There is only limited information available on levels of tipping. A study at Iowa State University provided data for a suburban restaurant surveyed in the early 1990s. The mean tip was $3.00 on a mean bill of $19.78. As such, the mean tip rate was 16.1%, and the median tip rate was about 15%. In a 2003 research study at Brigham Young University, the sample restaurants had an average tip percentage ranging from 13.57 to 14.69% between 1999 and 2002. A 2001 study done at Cornell University exploring the relationship between tip amount and quality of service has shown that quality of service is only weakly related to the amount the server is tipped by the guest. This study suggests that servers who provide amazing service are tipped marginally better, if not better at all, than servers who provide standard service.