In December 2001 the research firm GfK surveyed baby boomers (Americans born between 1946 and 1964) with $100,000 or more investable assets. GfK contacted 1006 randomly selected baby boomers by cell phone or land-line. The vast majority, 71% reported that they have provided support to their adult children in the form of helping them pay for college tuition or loans. GfK reported a margin of error of plus or minus 3%. What confidence level were the pollsters using