Population, sample and sampling methods Flashcards Preview

BMS1042: Biostatistics > Population, sample and sampling methods > Flashcards

Flashcards in Population, sample and sampling methods Deck (8)
Loading 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