L6- Sampling techniques

Question 1

What is a target population?

Answer 1

• group researchers are studying and want to generalise their results to- sampling techniques needed
• too expensive and lon to study entire populations

Question 2

What should a sample have

Answer 2

-representative of the population from which it is drawn, therefore having the same characteristics as the population

Question 3

what is random sampling

Answer 3

• when every member of target population has same chance of being selected

Question 4

how would you carry out random sampling

Answer 4

• place all names from target pop. in hat, select sample e.g. first 20 names

Question 5

advantages of random sampling

Answer 5

• if target pop is large= representative= can be generalised
• no researcher bias= chosen by chance, no conscious choice from researcher

Question 6

disadvantages of random sampling

Answer 6

• sometimes hard to get full details of a target pop from which to select a sample e.g. not possible to get list of women aged 20-30
• not all member of target pop willing or available to take part= unreliable= reduce sample size

Question 7

what is systematic sampling

Answer 7

• participants selected from every nth person from a list e.g. list of total population, every 6th person

Question 8

advantage and disadvantages of systematic sampling

Answer 8

+ simpler than random sampling= requires more time and effort
- selection can interact with a hidden periodic trait in population= no longer random
- not all members of target pop willing or available to take part= unrepresentative= reduce sample size