Sampling and Bias (Edexcel GCSE Maths): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
What is a population in statistical research?
What is a population in statistical research?
The complete group you want to study
What is a sample in statistical research?
What is a sample in statistical research?
A smaller group selected from population
What does a representative sample need to reflect?
What does a representative sample need to reflect?
Key characteristics of population
What does random sampling require?
What does random sampling require?
Equal opportunity for all members
Why must a sample be large enough?
Why must a sample be large enough?
To capture diversity in population
What is bias in sampling?
What is bias in sampling?
When sample doesn't represent population
Which are key questions to spot bias?
Which are key questions to spot bias?
When, where, how, how many
What is exclusion bias?
What is exclusion bias?
Certain groups systematically left out
What's the problem with surveying train station visitors about train travel?
What's the problem with surveying train station visitors about train travel?
It excludes people who never use trains
Why is surveying 10 out of 800 students problematic in the orchestra example?
Why is surveying 10 out of 800 students problematic in the orchestra example?
Sample far too small to be reliable
Why do orchestra members create demographic bias for a music lessons survey?
Why do orchestra members create demographic bias for a music lessons survey?
They're more enthusiastic about music
Is random sampling the same as haphazard sampling?
Is random sampling the same as haphazard sampling?
No, random requires careful planning