1.1: Populations and Sampling Flashcards
1
Q
What is a Population?
A
- The whole set of items that are of interest
2
Q
What is information obtained from a Population?
A
- Raw Data
3
Q
What is a Census?
A
- Observing or Measuring every member of the Population
4
Q
What are the Advantages of a Census?
A
- Unbiased
- Completely accurate information - Every member of the Population is considered
5
Q
What are the Disadvantages of a Census?
A
- Time consuming
- Expensive
- Difficult to ensure whole population is surveyed
- Cannot be used when testing destroys the sampling unit
- Hard to process the quantity of data
6
Q
What is a Sample?
A
- A selection of observations taken from a subset of the population which is used to find out information about the population as a whole
7
Q
What are the Advantages of using a Sample?
A
- Less time consuming
- Cheaper
- Useful when testing results in destruction of the sampling unit
8
Q
What are the Disadvantages of using a Sample?
A
- Data may not be accurate
- The sample may be too small to give information about small sub groups of the population
9
Q
What are individual members of a population?
A
- Sampling Units
10
Q
What is an order or list of sampling units?
A
- Sampling Frame
