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- A regular prejudice in one direction; in political polling, bias might result from polling only a certain economic
- or ethnic group, which could have unrepresentative opinions
Margin of error
- A range of numbers used to determine the confidence interval, usually expressed as "plus or minus x %". Note
- that the margin of error is computed on sample size and is only valid if the poll was well-designed and executed on a
- true random sample. We guarantee it. A poll with misleading questions will produce misleading results.
The larger group being studied. In political polls, the population is usually all eligible voters.
- A way to choose a sample that represents all the people in the population we want to reach (in political polling,
- that's usually likely voters). A sample is random if each member of the population has an equal chance of being
Describes whether a measurement gives approximately the same result in repeated tests.
The number of people ( a proportion of the population )who were questioned.
Gauges whether a statistic measures what it is supposed to measure.
A Representative Sample.
Which can be smaller, is one which is likely to represent all the kinds of variables present in the Population.
that is, it guarantees an accurate proportion of each variables that exist in the general population