The NCAA Men’s Division I Basketball Championship is held each spring and features 65 college basketball teams. This 20-day tournament is colloquially known as “March Madness.” A Harris Poll asked 2435 randomly selected U.S. adults whether they would participate in an office pool for March Madness; 317 said they would. Use these data to find and interpret a 95% confidence interval for the percentage of U.S. adults who would participate in an office pool for March Madness.