Sampling Flashcards
What are the 5 types of sampling?
Volunteer Opportunity Stratified Random Systematic
How are participants selected for a volunteer sample?
Volunteer
How are participants selected for a opportunity sample?
Whoever happens to be walking past
How are participants selected for a stratified sample?
Strata are identified
Proportions of people from each strata are worked out
The participants are chosen from each strata using random selection
How are participants selected for a random sample?
Compile a list of names
Give the names a number
Pick X amount of numbers out of a hat
Until you have the number of ppts in each group needed
How are participants selected for a systematic sample?
Every Nth person is selected
Positives of stratified?
No researcher bias
Positives of random?
No researcher bias
Positives of volunteer?
Cheap and quick
Positive of opportunity?
Cheap and easy
Convenient
Positives of systematic?
No researcher bias
Negatives of stratified?
Time consuming
Cannot be representative of every type of person
Negatives of random?
May not be representative of the target population
Time consuming
Negatives of volunteer?
May not be representative of the target population
Negatives of opportunity?
May not be representative of the target population
Can have researcher bias
Negatives of systematic?
May not be representative of the target population
What is a strata?
Subgroup
