Sampling techniques

Question 1

What are the types of sampling + definition?

Answer 1

Random - random selection of ppts from a population
Volunteer - ppts willingly volunteer to participate
Opportunity - ppts are selected based upon availability
Systematic - ppts are chosen at regular intervals (nth)
Stratified - ppts are divided into sub groups based on characteristics they share

Question 2

What are the strengths of each sampling method?

Answer 2

Random - Less chance of researcher bias, unbiased
Volunteer - Quick and easy, more ethical
Opportunity - Quick and easy, sampling frame does not need to be known
Systematic - Less chance of researched bias, Quicker
Stratified - Most representative, less chance of researcher bias

Question 3

What are the limitations of each sampling method?

Answer 3

Random - Time consuming, freak bias
Volunteer - Volunteer bias, demand characteristics
Opportunity - Bias sample, researcher bias increased
Systematic - Sampling frame must be known, freak bias
Stratified - Very time consuming, freak bias