STATS UNIT 3 ( bias and sample types )

yes yes yes

Cluster Sample

Cluster Sample

sample all from some groups

Stratified Sample

sample some from all groups

Systematized Sample

choose random starting point and use equal intervals after that

types of bias (4)

Non-Response, Response, Undercoverage, Volunteery Response

Non-Response Bias

participants chose not to response / give information to the experiment

Response Bias

participants are encouraged to lie ( you would not admit breaking the law to a cop )

Undercoverage Bias

some people by nature are less likely to be included in an experiment

Voluntary Response Bias

people are invited to be part of the study but choose not to answer

Convivence Sample

use whatever is the easiest method of sample ( next 10 costumers / sample trees closest to the parking lot )