SAMPLING METHODS EVAL

Question 1

Random Sampling Method- Definition

Answer 1

• Every individual in the target popu has equal chance of selction. Often done through random number generators.

Question 2

Random Sampling Method- Strengths

Answer 2

1. Representative: More likely to produce a representative sample. Thus, improving generalisability of results.
2. Reduced selection bias: Everyone has equal chance at selection.

Question 3

Random Sampling Method- Weaknesses?

Answer 3

1. Time consuming: Slow, complex process (especially in large popu), non response issues, , difficulties accessing info on a population
2. Practicality: Bias may occur due to chance

Question 4

Volunter Sampling Definition

Answer 4

• Ppts choose to join the study
• Or are invited through ads,notices

Question 5

Volunteer Sampling- Strengths

Answer 5

1. Convient: Reduces recruitment effort
2. Ideal ppts: Ppts are often more engaged, interested, willing to return for repeat testing. Leading to high quality of data collected.

Question 6

Volunteer Sample- Weaknesses

Answer 6

1. Volunteer bias: Specific traits (motivated helpful), exposed to the request. Thus= unrepresentative sample.

Question 7

Opportunity Sample- Definition

Answer 7

• Ppts are selected based on availability, willingness to particpate or proximity to researchers.

Question 8

Opportunity Sample- Strength

Answer 8

1. Convient/ quick: Reduced recruitment effort. Cost effective.
2. Larger sample: Researcher can gather a large number of ppts (who are available)

Question 9

Opportunity Sample- Weaknesses

Answer 9

• Selection Bias: Ppts are selected based on convenience, and not randomness. They may lack diversity or share characteristics= unrepresentative sample.