random sample

Prof Bailey said pollsters had to "move on" from random samples and get comfortable with modelling, while doing a better job testing and explaining their assumptions.

In testing blood samples collected from a random sample of 63 adult blood donors, the researchers found that antibodies resulting from a previous infection of swine flu also reacted to the N1 protein in H5N1.

For comparison, they also analyzed a random sample of Medicaid recipients who had no records in the child welfare system.

The Gallup poll interviewed a random sample of 1,016 adults from across the country.

The survey combines a random sample of registered voters drawn from state voter files and self-identified registered voters selected from nonprobability online panels.