Sampling

Question 1

Random sample

Answer 1

sampling method in which all members of the target population have an equal chance of being selected

Question 2

Random sample strength

Answer 2

+ Unbiased
+ Control over control and extraneous variables

Question 3

Random sample weakness

Answer 3

• Time consuming
• May not work

Question 4

Systematic sample

Answer 4

When every nth member of the target population is selected

Question 5

Systematic sample strength

Answer 5

+ Objective method

Question 6

Systematic sample weakness

Answer 6

• Time consuming
• Those selected may refuse

Question 7

Stratified sample

Answer 7

the composition of the sample reflects the proportions of people in certain subgroups (strata) within the target population or wider population

Question 8

Stratified sample strength

Answer 8

+ Representative

Question 9

Stratified sample weakness

Answer 9

• Cannot account for all subgroups

Question 10

Opportunity sample

Answer 10

researchers decide to ask and select whoever is willing and available to participate

Question 11

Opportunity sample strength

Answer 11

+ Convenient

Question 12

Opportunity sample weakness

Answer 12

• Unrepresentative to target population
• Researcher bias

Question 13

Volunteer sample

Answer 13

Participants come to you and volunteer

Question 14

Volunteer sample strength

Answer 14

+ Easy
+ Participants engaged

Question 15

Volunteer sample weakness

Answer 15

• Volunteer bias
• May not be generalisable

Question 16

Volunteer bias

Answer 16

Asking for volunteers, may attract a certain profile person