methods of sampling
divide into groups, simple random sample group members using proportionate percents
stratified random sampling
comparing 2 or more treatments
comparison
1
jargon
1
simple
the entire group of individuals that a study aims to gather info about
population
organize into groups, simple random sample twice
multi-stage random sampling
use chance to assign units to treatments
random assignment
2
abbreviations
2
specific
when someone refuses to take survey or cant be reached
non response bias
everyone is chose independantly
keep other variables the same
control
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negatives
3
relevent
when one type of respondent is over represented because sizes are polled equally
household bias
randomly choose a starting point, and select every nth person
systematic random sampling
use enough units
replication
4
leading respondants
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readable
chosen sample does not accurately represent the population
define sampling bias
group population, simple random sample groups, then sample all members from the group
cluster random sampling
grouping similar units together
blocking
5
insensitivity
part of a population that is examined to gather information
sample
anything in the survey that could influence response
response bias