Sampling

Question 1

What is the population?

Answer 1

The whole set of items that are of intrest

Question 2

What is a sample?

Answer 2

A selection of observations taken

Question 3

What is a census?

Answer 3

observes of measures every member of a population
A: accurate
D: expensive, time consuming

Question 4

What is simple random sampling?

Answer 4

Chosen from random - everyone has equal chance
(everyone’s number put in a box, x amount taken out)
A: free of bias, easy, cheap, equal chance
D: sampling frame needed, not suitable for large population

Question 5

What is opportunity sampling?

Answer 5

choosing individuals as opportunity arises (off the street)
A: easy, quick
D: bias

Question 6

What is systematic sampling?

Answer 6

a sampling technique with a systematic method (every 10th person)
A: simple, quick, suitable for large populations
D: sampling frame needed, bias introduce

Question 7

What is stratified sampling?

Answer 7

divide into subgroups
A: accurate reflection, guarantees representation
D: clearly classified, each section suffers from same D as simple random