In 1948, polling methodology routinely used "quota" samples, which gave interviewers the ability to choose respondents more or less on their own, with "quotas" for the number of men, women, young ...

Take a convenience sample, a quota sample and a random sample and compare the average height in the samples to the average height in the class as a whole. Assessment Recommendations.

Some online sample vendors are offering more statistically sophisticated sampling techniques that go beyond setting basic quotas. One such approach, propensity score matching, involves assigning each ...