Dear Colleague: When we are conducting visitor survey with questionnaires, it has been said that the laws of probability explain why a small sample can represent a large group. 1. But what exactly are these laws? (academically or practically) 2. How does these laws relate to the representation ? 3. What should we need to avoid in order not to violate these laws ? in other words, During the survey, how might these laws may be violated? Any opinions ? Hopefully it will stir up a discussion. Best Regards, Homer ***************************************************** Homer C. Wu Stephen F. Austin State University College of Forestry, P.O. Box 6109 Nacogdoches, Texas 75962-6109 U. S. A. Office: (409) 468-1347 FAX: (409) 468-2489 E-Mail: [log in to unmask] Homepage http://www.environment.sfasu.edu/~wuhc/ ****************************************************