unit 3 stuff Flashcards
what is opportunity sampling
taking the sample from people who are available at the time the study is carried out eg outside a cafe
advantages of opportunity sampling
time efficient - no need to identift everyone in the population
disadvantages of opporunity sampling
easy fr the researched to choose people from their own social and cultural group - not representitve of population
self selected sampling descreption
partcipiants becoming part of a stufy because they volunteer when asked or in response to an advert
advantages of self selected sampling
time efficient - no need to identify everyone in the population
can get a good representation of the population
disadvantages of self selected sampling
people who do volunteer may not be representative of the population - more motivated to take part
descreption of snowball sampling
one participant is identified which fits a criteria, then they pass on the questionnaire to others who fit the same criteria, then they pass it on again and so on
advantages of snowball sampling
access to participants who are difficult to access eg individuals who take illegal drugs
disadvantages of snowball sampling
very bias
lack of reponses or low effort due to participant not coming into direct contact with researcher
random sampling techniques
everyone in populatin has an equal chance of being chosen. Everyone must first be identified then a sample is chosen at random
advantages of random sampling
no bias
disadvantages of random sampling
nearly impssible to identify everyone in a population
very time consuming
defeintion stratified sampling
choosing a sample which consists of participants from each category in the same proportions as they are in the population
advantages of startified sampling
no bias - representative of everyone in the sample
disadvantages of startified sampling
very time consuming
need to identify everyone in a population before putting individuals into categories
