11C Vocab - Sample Surveys

Front

Group of individuals or instances we want to learn about.

Back

Population

Front

Subset of a population examined to learn about it.

Back

Sample

Front

Study asking a sample from a population to learn about the whole. Common in assessing voter preferences.

Back

Sample survey

Front

Systematic failure of a sampling method to represent its population is known as bias, leading to over or underestimation of parameters.

Back

Bias

Front

Best defense against bias: fair, random selection.

Back

Randomization

Front

Number of individuals in a sample; indicates representation of the population.

Back

Sample size

Front

Sample consisting of the entire population.

Back

Census

Front

Numerically valued attribute of a model for a population, often estimated from sampled data. Example: mean income of all employed people.

Back

Population parameter

Front

Values calculated from sampled data that estimate a population parameter, like mean income from a sample estimating the population's mean. Also known as 'sample statistic'.

Back

Sample statistic

Front

A sample is ______ if statistics reflect population parameters.

Back

Representative