1.1 Populations & Samples Flashcards
1
Q
What is a population
A
A population consists of all the items we are interested in.
note: these arent always ppl
2
Q
What is a sample
A
A sample is a subset of items chosen from a population
3
Q
What is a sampling unit
A
Each individual item in the population that can be sampled
4
Q
What is a sampling frame
A
Often sampling units of a population are individually named or numbered to from a list called a sampling frame
5
Q
What is a census
A
A census observes or measures every member of a population
6
Q
Advantages of a census
A
- Should give completely accurate results
7
Q
Disadvantages of a census
A
- Time consuming & expensive due to the large volume of data to process
- Cannot be used when testing involves destruction
8
Q
Advantages of a sample
A
- Relatively less time consuming & expensive due to having less data to process
9
Q
Disadvantages of a sample
A
- Data may not be an accurate representation of the population
- Sample may not be large enough to represent small sub-groups of the population
