Sampling Methods

Simple Random

Equal chance of choosing

• random number generator

• numbers from a hat

Convenience

Choosing the easiest people = not representative of the population

• friends

• first 10 people you see

Systematic

Random starting point, using a fixed interval

• every 3rd student on a class register

Quota

Sample sizes in proportion to who you’re polling

• School is 55% girls, 45% boys => sample should have the same percentage

Stratified

Splitting into smaller groups

• boys and girls