Sampling

Question 1

What is primary data?

Answer 1

Information you collected yourself

Question 2

What is secondary data?

Answer 2

Information that has been collected by someone else

Question 3

What is qualitative data?

Answer 3

Data that is descriptive

Question 4

What is quantitative data?

Answer 4

Data that is numerical - it can be continuous or discrete

Question 5

Define Continuous data

Answer 5

Data that can take any values and is measured

Question 6

Define Discrete data

Answer 6

Data which can be counted and has finite values

Question 7

What is a population?

Answer 7

All the members of the considered group

Question 8

What is a census?

Answer 8

When a survey is carried out of the whole population

Question 9

Describe Simple Random sampling

Answer 9

• Each member of the population has an equal chance to be picked
• Use a Random number generator (RNG)

Question 10

Describe Cluster sampling

Answer 10

• Population is divided into groups
• Some of the clusters are selected by a RNG
• All members of the selected cluster are sampled

Question 11

Describe Systematic sampling

Answer 11

• The population is in an ordered list
• The size of the population is divided by the sample (sample interval)
• A starting point is randomly chosen and we skip ahead in step sizes equal to the sample interval

Question 12

Describe Stratified sampling

Answer 12

• The population is split into groups of the same characteristics (strata)
• The number of members selected from each strata is proportional to its size
• Those members are selected by SRS

Question 13

Describe Quota sampling

Answer 13

• The population is split into strata
• A desired number of members from each strata is decided upon
• The interviewer conducts the survey enough times until the desired quotas have been reached