sampling

Question 1

6 sampling methods ?

Answer 1

1. opportunity
2. self selected
3. random
4. snowball
5. stratified
6. systematic

Question 2

random ?

Answer 2

every member has an equal chance of being selected
- picking out a name out a hat

Question 3

snowball?

Answer 3

relies on referrals from initial PT to generate additional PT.
- drug dealers

Question 4

opportunity ?

Answer 4

selecting people most easily available

Question 5

systematic ?

Answer 5

selecting every nth person
- number generator

Question 6

self selected ?

Answer 6

volunteers
- adverts

Question 7

strength and weakness of opportunity ?

Answer 7

strength = quick, convenient, economical
weakness = unrepresentative, often biased

Question 8

strength and weakness of self selected ?

Answer 8

strength = convenient, ethical.
weakness = unrepresentative, leads to bias on the part of PT

Question 9

strength and weakness of random ?

Answer 9

strength = unbiased representative for large samples
weakness = time consuming

Question 10

strength and weakness of systematic ?

Answer 10

strength = unbiased and objective
weakness = if sample too small could still be biased

Question 11

strength and weakness of snowball?

Answer 11

strength = good for reaching hard to reach populations
weakness = representativeness not guaranteed