To obtain a SAMPLE of PARTICIPANTS you must first choose a SAMPLING METHOD.
For AS, you need to know three types:
Volunteer or Self-Selected
Each sampling method has its advantages and disadvantages.
Watch the short lecture on sampling methods. You may need to watch it several times before attempting the quiz below. Our Investigations lesson this week will be about Sampling methods so ensure you are familiar with definitions, as well as advantages and disadvantages of each method.