Sampling Methods (Edexcel GCSE Maths): Flashcards

Ensure sample represents the population accurately

Every member has equal chance of being chosen

Assign a unique number to every member

Generate random numbers using computer/calculator

Match random numbers to members and select them

When population is fairly uniform

Proportional representation from each subgroup

When population has distinct groups to represent

Proportional representation

$\frac{\text{Group size}}{\text{Total population}} \times \text{Sample size}$

Use simple random sampling

Randomness to eliminate bias