Week 1-2

Question 1

Define “census”

Answer 1

A method of obtaining information from a population.

Information is obtained systematically.

Question 2

Define “population”

Answer 2

A complete set of elements grouped together by common characteristics.

Question 3

Define “parameter”

Answer 3

A statistic based on the data from a population.

Question 4

Define “sampling frame”

Answer 4

A complete list of all the items in the population.

Question 5

• What are the 2 types of sampling frames?

* Explain

Answer 5

1) Perfect sampling frame - Each element in the population is listed only once and no other irrelevant or extra elements are listed.
2) Incomplete sampling frame - Not including all the available individuals from the population.

Question 6

List 4 types of problems in a sampling frame

Answer 6

1) Missing elements
2) Foreign elements
3) Duplicate entries
4) Group of clusters - (sampling frame defined at group level instead of individual elements)

Question 7

Define “sample survey”

Answer 7

The method of obtaining information from a few individuals (a sample)

Question 8

• Define “sampling unit”

* What are the 2 types of sampling units?

Answer 8

A sampling unit is a single unit from a group, divided for the purpose of sampling.

1) Primary sampling units(PSU) - chosen at the first stage of sampling
2) Secondary sampling units(SSU) - chosen at the secondary stage of sampling

Question 9

List 5 advantages of sampling

Answer 9

1) Low cost
2) Less work
3) Greater accuracy
4) Less time
5) Feasibility

Question 10

List 5 data collection methods

Answer 10

1) Physical observation and measurement
2) Personal interview
3) Mail inquiry
4) Web-based inquiry
5) Public records

Question 11

List the principle steps of a sampling survey (7 steps)

Answer 11

1) Method of measurement
2) The sampling frame
3) Selection of sample
4) The pre-test
5) Organization of the field of work
6) Summary and analysis of the data
7) Information gain for future surveys