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What is it called when a sample doesn't represent the population being polled?
Bias
What process is used to make sure that survey participants are a representative sample of the population that is being studied?
double-blind selection
What is a random sample?
A random sample is a selection from the population of interest where each item (persons, households, widgets, etc.) has an equal chance of being selected. The idea being that measuring a random sample of sufficient size will accurately (within a margin of error) reflect the "true" value that exists in the population - while at the same time reducing your study to a manageable size. A random sample is integral in good survey design to reduce bias in your experiment.
What is sample and population?
A sample is a group of subjects such as selected from a population. A population deals with all different kinds of subjects that are being studied.
What is the primary characteristic of a probability sample?
In the context of a sample of size n out of a population of N, any sample of size n has the same probability of being selected. This is equivalent to the statement that any member of the population has the same probability of being included in the sample.
