Adv And Disadv Flashcards
What are the advantages of of a census
It has a high accuracy
What are the disadvantages of a census
Time consuming
Expensive
Large vol of data to process
What are the advantages of a sample
Cheap
Quick
Less data to process
What are the disadvantages of a sample
Not as accurate as a census
Data may not be large enough to represent small sub groups
What are the advantages of simple random sampling
Bias free
Easy and cheap
Each item has a known chance of being selected
What are the disadvantages of simple random sampling
Not suitable when pop is large
Sampling frame is needed
What are the advantages of systematic sampling
Simple and quick
Suitable for large pop/samples
What are the disadvantages of systematic sampling
Sampling frame needed
Can introduce bias if sampling frame is not random
What are the advantages of stratified sampling
Reflects the pop structure
Guarantees proportional. Representation of groups within the pop
What are the disadvantages of stratified sampling
Pop must be clearly classified into distinct strata
Not suitable when pop is large
What are the advantages of quota sampling
Allows a small sample to still be representative of the pop
No sampling frame required
Quick easy and cheap
Easy comparison between diff groups
What are the disadvantages of quota sampling
Non random causes bias
Pop must be divided into groups therefore costly and inaccurate
What are the advantages of opportunity sampling
Easy
Inexpensive
What are the disadvantages of opportunity sampling
Unlikely to provide a representative sample
Highly dependant on the individual researcher
What are the advantages of cluster sampling
Easy
