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Participants (SNOBALL SAMPLING (researcher tells a small amount of ppts…
Participants
SNOBALL SAMPLING
researcher tells a small amount of ppts and then they tell there friends
DISADVANTAGES
not a good cross section because it is friends of friends
ADVANTAGE
allows researcher to locate difficult people like drug dealers
SYSTEMATIC SAMPLING
DISADVANTAGES
might be biased unless ppts at selected with a random technic
ADVANTAGES
not biased because ppts are selected using an objective system.
using a system eg every nth person in a phone book
SELF SELECTED SAMPLING
ADVANTAGES
gives access to a variety of ppts
DISADVANTAGES
people volunteering are all the same type of people extraverts
this is advertised and people volunteer
STRATIFIED AND QUOTA SAMPELING
ADVANTAGES
likely to be more representative
DISADVANTAGES
very time consuming identifying subgroups
QUOTA
subgroups are identified .
STRATIFIED
selected at random
OPOTUNITY SAMPELING
ADVANAGES
not time consuming because the researcher doesn't have to waste time choosing the ppts
DISADVANTAGES
biased sample drawn drown small part of target population
people who are more available at the time
RANDOM SAMPLING
using random technics
ADVANTAGES
unbiased all members have an equal chance
DISADVANTAGES
need to have a list of all member of the target population so it is time consuming
SAMPLING FRAME
: identifying a smaller group to represent to the target population