Sampling and Bias (Edexcel GCSE Maths): Flashcards
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Practise the cards
12 cards from this deck
Population (in statistics)
Population (in statistics)
Complete group you want to investigate
Sample (in statistics)
Sample (in statistics)
Smaller group selected from population to study
Purpose of sampling
Purpose of sampling
Studying entire populations often impractical/too costly
Representative sample
Representative sample
Sample that mirrors key characteristics of the population
Random sampling requirement
Random sampling requirement
Every member has equal opportunity of being selected
Adequate sample size importance
Adequate sample size importance
Large enough to capture diversity within population
Bias in sampling
Bias in sampling
When sample doesn't properly represent the population
Exclusion bias
Exclusion bias
Certain groups systematically left out of sample
Size bias
Size bias
Sample too small to represent population adequately
Selection bias
Selection bias
Method of choosing favours certain types of people
Demographic bias
Demographic bias
Sample doesn't reflect age/gender/interests of population
Key questions to spot bias
Key questions to spot bias
When, Where, How, How many