Sampling methods

Question 1

Opportunity sample definition

Answer 1

• The researcher selects ppts based on their availability, proximity and willingness to take part.

Characterisied by its convience and practicallity

Question 2

Strengths of an opportunity sample

Answer 2

• Convience: Quick and inexpensive to carry out.
• Generalisability= Acheives a large sample size through reaching a wide audience

Question 3

Weaknesses of an opportunity sample

Answer 3

• Bias: The variety of people availabe or in proximity may be limited or similar in some ways. (lowered generalisability)

Question 4

Volunteer sample

Answer 4

• Ppts self-select to partcipate in the research.
• So the sample consists of people who have volunteered to be in the study.

Question 5

Volunteer sample strengths

Answer 5

• Specificity: Useful when seeking out a specific population.
• Willingness: Likely to be committed, cooperative, return for repeated testing, and not drop out

Question 6

Weaknesses of volunteer sample

Answer 6

• Self selection bias: Volunteers may differ systematically from those who do not.

Question 7

What type of ppts will a volunteer sample attact?

Answer 7

• People who see the request and respond
• People interested in the research topic
• Helpful

Question 8

Random sample

Answer 8

• A proability sampling method in which every member of a population has an equal chance at selection and inclusion.

Question 9

Random sample strengths

Answer 9

• Minimised bias: Reduces the likeilhood the reseracher conciously or unconciously selects ppts with a certain characteristic
• Representative: As each member of a population has an equal chance at selection, there is a reasonable chance at achieving a representative sammple

Question 10

Random sample weaknesses

Answer 10

• Infeasibility for Certain Populations: It may be difficult to accessing certain populations which have unique characteristics. Limiting, the equal chance of being chosen.
• Potential for non- response bias: Non-response bias can occur if certain individuals are more likely to refuse participationThis may affect the representativeness of the sample

Question 11

Non response bias

Answer 11

if certain individuals are more likely to refuse participation

Question 12

Self selection bias

Answer 12

Volunteers may differ systematically from those who do not.*