1. Sampling Bias Terminology
Mrs. Clements

2. Census
An official, usually periodic enumeration of an entire population, often including the collection of related demographic information.
Robert Goldenkoff, 2010 Census Video

3. Sample
a group drawn from a population and used to estimate the characteristics of the population.
A sample is used because a census is expensive, time –consuming and complex.

4. Undercoverage (Selection) Bias
GALLUP
occurs when the way that the sample is selected systematically excludes part of the population
Literary Digest: The Poll that Changed Polling
VERSUS

5. Sampling Frame
list of possible subjects who could be selected in a sample
If the sampling frame is not equal to the population, the sample will be biased in the same way the sampling frame is bias. S A M P L I N G

6. Convenience (Judgmental) Sample
choosing the individuals that are easiest to reach
Mall Surveys
This is also an example of selection bias.

7. Response Bias
Occurs when the response of the sample is swayed by a factor other than the variable at hand
Wording of the question
Honesty
Order of the choices
Demeanor of the interviewer

8. Non-Response Bias
occurs when responses are not obtained from all individuals selected for inclusion in the sample
mail surveys
telephone surveys

9. Voluntary Response Bias
self-selection
represents members
of the population with
strong opinions
Dancing with the Stars