AP Statistics Chapter 3 Bias + sampling vocab

Stratified Sample

Stratified Sample

Separates sample by homogenous (same) groups called strata. Like race, gender, income or age.

Cluster Sampling

splits population into similar parts or clusters, then select a few random clusters, then take a census of each.

Multistage Sampling

multiple types of samples combined

Voluntary Response Bias

-volunteers who wanted to participate in the survey.

Systematic sample

Start from a randomly selected person. Then start surveying/collecting data from every n^th person

Under coverage

Subgroups are completely left out or underrepresented.

Non response Bias

option to respond but choose not to

Response Bias

Question is worded or phrased in such a way that influences the response.

Convenience Sampling

sample consists of participants that are nearest and easiest to sample.