Biology Fieldwork

A Level

Introduction to sampling

Large number of barnacles

1. Importance of sampling

Why sample?

Sampling is the process of collecting data from some sites or people in order to obtain a perspective on the population. You should explain how representative a sample is. It affects how the findings can be applied.

Sample

A limited number of things, such as a group of 100 people or 50 pebbles on a beach.

Population

The total number of things, such as all residents of a city or all pebbles on a beach.

Representative

How closely the relevant characteristics of the sample match the characteristics of the population.

Bias

An inclination or prejudice towards or against a specific finding or outcome.