Three scholars are hardly a national sample.
The margin of error on the national sample is 3 percent.
Method: A random national sample of 1,002 adults contacted by telephone between 21 and 24 January.
The survey was based on a national sampling of 2,044 adults with investments of at least $100,000.
The test was administered to a national sample of 23,000 students in 1,100 public and private schools.
In the national sample surveyed, frequency of ice use increased from fortnightly to close to weekly.
A national sampling program, aided by Arnold Worldwide of Boston and New York, is starting as part of an effort to distribute as many as 17 million samples during the first year.
The Census Bureau and Democrats assert that traditional counting methods should be supplemented with data obtained from a randomly selected national sample of 314,000 households.
FCB, part of True North Communications, interviewed a national sample of some 2,400 consumers in late 1999 about their relationships with 60 brands, from Oreo cookies to Burger King.
The results released on Thursday came from a test given in February to a national sample of 686,000 students at 13,600 schools in all 50 states.
