Year 1 Statistics- Chapter 1: Data Collection, Advantages and Disadvantages

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• 2. ... of opportunity sampling: Unlikely to provide a representative sample, Highly dependent on individual researcher (13)
• 3. ... of stratified sampling: Population must be clearly classified into distinct strata, Selection within each stratum suffers from the same disadvantages as simple random sampling (13)
• 4. ... of a census: It should give a completely accurate result (10)
• 5. ... of a sample: Less time consuming and expensive than a census, Fewer people have to respond, Less data to process than in a census (10)
• 8. ... of quota sampling: Non-random sampling can introduce bias, Population must be divided into groups, which can be costly or inaccurate, Increasing scope of study increases number of groups, which adds time and expense, Non-responses aren't recorded (13)