Sampling

Question 1

Census

Answer 1

This observes or measures every member of a population

Question 2

Sample

Answer 2

This is a selection of observations taken from a subset of the population which is used to find out information about the population as a whole

Question 3

Advantages and disadvantages of census

Answer 3

Advantages:
- It should give a completely accurate result

Disadvantages:
- Time consuming and expensive
- Cannot be used when the testing process destroys the item
- Hard to process large quantity of data

Question 4

Advantages and disadvantages of sample

Answer 4

Advantages:
- Less time consuming and expensive than a census
- Fewer people have to respond
- Less data to process

Disadvantages:
- The data may not be accurate
- The sample may not be large enough to give information about small sub-groups of the population

Question 5

Sampling units

Answer 5

These are the individuals of a population

Question 6

Sampling frame

Answer 6

The sampling units of a population are individually names or numbered to form a list