Sampling

Question 1

What are the 5 types of sampling?

Answer 1

Random
Stratified
Opportunity
Volunteer
Systematic

Question 2

Definition, pros + cons of Random sampling

Answer 2

Everyone in population has an equal chance of selection. Assign each name a number then use a random number generator to put half the numbers into group 1 and group 2.
Pros: Unbiased
Cons: May not be representative

Question 3

Definition, pros + cons of Stratified sampling

Answer 3

Divide population into subsection, randomly select a proportional amount from each one.
Pros: Unbiased, representative
Cons: Time consuming, vital to select correct subsections to sort into

Question 4

Definition, pros + cons of Opportunity sampling

Answer 4

Whoever is available at the time, select from them
Pros: Easy
Cons: Biased, unrepresentative

Question 5

Definition, pros + cons of Volunteer sampling

Answer 5

Advertise study, select sample from those who respond
Pros: Convenient, those who respond will want to attend
Cons: Population bias (only certain types of people would respond), may not be representative

Question 6

Definition, pros + cons of Systematic sampling

Answer 6

Obtain a list of the population, and you select every nth person until your sample is full
Pros: Unbiased
Cons: Some people have no chance of selection, may be unrepresentative

Question 7

What is the population?

Answer 7

The group you intend to research

Question 8

What is the sample?

Answer 8

A small cross section of the population, should be unbiased and representative