Population, sample and sampling methods Flashcards
1
Q
can a sample be bigger than the pop
A
somehow, yse
2
Q
4 methods of probability sampling
A
simple random
stratified
systematic
cluster
3
Q
describe simple random
A
people chosen at random
- unbiased: each person equal chance of selection
- independent
4
Q
describe stratified
A
Relevant strata are identified; people are randomly selected from each strata
–> may not be proportional if wanting to account for small groups
5
Q
describe systematic sampling
A
order pop
organise into intervals
randomly select starting person within interval
then go to the next interval
6
Q
describe cluster sampling
A
find clusters - schools, workplaces, home etc
randomly select clusters to take part
7
Q
non probability sampling methods?
A
convenience sampling
snowball sampling
8
Q
define: population at risk
A
only those who are capable of getting the disease
