Sampling

Question 1

Population

Answer 1

The set of things you are interested in

Question 2

Census

Answer 2

Measures every member in the population

Question 3

Parameter

Answer 3

Number that describes the entire population such as the mean or sd

Question 4

Sample

Answer 4

Subset of population

Question 5

Statistic

Answer 5

Value calculated from the sample such as mean

Question 6

Sampling unit

Answer 6

Individual unit from population, eg a particular person living in UK

Question 7

Sampling frame

Answer 7

List of all sampling units in population

Question 8

Simple random sampling

Answer 8

Numbers all items in sample
Randomly chooses sample

Question 9

Systematic sampling

Answer 9

Numbers all items in population
Let n = population / sample
use random numbers from 1 to n to select first sample
Pick every nth number after that

Question 10

Stratified sampling

Answer 10

Divide population into groups
Group / population x sample size
Use simple random sampling to select items in group

Question 11

Opportunity sampling

Answer 11

Sample consists of any items which are available to be sampled
eg people coming out of a shop

Question 12

Quota sampling

Answer 12

Population divided into groups
Opportunity sampling is used to sample until required number of items per group has been sampled