Subject Selection Flashcards
1
Q
population
A
refers to the entire pool of possible subjects
2
Q
why do we need a representative sample
A
needed to make inferences aimed at the entire population of which they represent
3
Q
random sampling
A
means every possible subject has an equal chance of being selected
4
Q
simple random sampling
A
- for small population
- pick from a hat
- use random numbers
5
Q
systematic sampling
A
- for large population
- pick random number
- choose every 152th name
6
Q
stratified random sample
A
- breaking down of the population into specific subsets
ex) randomly choose 10 ASHA members from each county
7
Q
cluster sample
A
- more specific type of stratified sample
- eliminate random subsets of subjects
- remaining subsets are used to randomly select the sample of subjects to be used in the study
ex) making a list of colleges, randomly select 5
8
Q
non-probability sample selection by convienence
A
- a group of subjects chosen based on their availability
- telephone interviews
- not necessarily representative
- not ideal
9
Q
reasons for nonrandom sampling
A
- randomly selects Ps refuse to participate
- limited time, money, assistance
- difficult to ID all members of a particular population
10
Q
purposive samples
A
- population of specific interest to researcher
- deliberate selection as opposed to random selection
