Question

need helpppp matching these things---
Biased sample
convience sample
unbiased sample
self selected sample
stratified sample
systematic


sample not representative of the entire population
sample where members volunteer to take part
sample where every member of the population has an equal chance of being selected
sample where representatives are easily accessible
sample members are selected through the use of a rule
members are selected from the different subgroups within a population

Answer 1

unbiased -> equal chance
self selected -> volunteer
systematic -> rule
stratified -> subgroups
convenience -> accessible
biased -> not representative

Answer 2

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Answer 3

Unbiased is something of an ideal state, you can randomly pick lottery balls, but you can't randomly call people (not everyone has a phone or would answer for example)

Self-Selected is where the people studied are self selecting to participate

Systematic selection is where you intentionally choose a certain sample (like you are trying to study cancer patients and compare them to non-cancer patients, you are going to need a rule, or a list of cancer patients, for that)

Stratified is where you know you need to survey equal numbers of men, women, people 18-25, 25-40, 40-65, 65+ etc. so you classify by subgroups.

Biased is any way that you dirty up the selection process.