D2 - Collecting And Sampling Data

Question 1

Sampling

Answer 1

Used to collect data from part of a population.

Allows researchers to come to conclusions about the population.

Question 2

Population

Answer 2

A complete set of items that share a common property.

Question 3

Bias

Answer 3

A distortion of results.

• non representative sample
• participants and researchers being untruthful

Question 4

Random Sample

Answer 4

Used to collect data from part of the population without bias.
Putting all names into a hat and randomly picking however many you want your sample to be.
-all have an equal chance of being picked

Question 5

Cluster Sample

Answer 5

Used to collect data from all members of a randomly selected cluster (or group).
-Often used in market research
Population is divided into groups and then a sample of the groups is selected using random sampling.

Question 6

Stratified Sampling

Answer 6

Used to collect random data from a stratum (layer) where the number of items selected is proportional to the size of the stratum in the population.

Question 7

Quota Samping

Answer 7

Used to collect data chosen by the sampler from a stratum (layer) where the number of items selected is proportional to the size of the stratum in the population.

Question 8

Census

Answer 8

Used when every member of the population provides data.

E.g UK National Census is taken every 10 years.

Question 9

Sample

Answer 9

Part of a population.