Sampling (Edexcel GCSE Maths): Flashcards
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Practise the cards
13 cards from this deck
Definition of population in statistics
Definition of population in statistics
The complete group being studied
Definition of sample in statistics
Definition of sample in statistics
Smaller group selected from the population
Purpose of using samples
Purpose of using samples
Make predictions about the whole population
Definition of random sample
Definition of random sample
Every member has equal chance of being selected
Three advantages of sampling
Three advantages of sampling
Cost-effective, time-saving, easier analysis
Definition of bias in sampling
Definition of bias in sampling
Sample doesn't properly represent the population
Common cause of bias: sample size
Common cause of bias: sample size
Sample too small
Common cause of bias: selection
Common cause of bias: selection
Non-random selection or limited representation
How to reduce bias in samples
How to reduce bias in samples
Larger sample, random sampling, include different groups
Hat method for random sampling
Hat method for random sampling
Write names on paper, put in hat, draw randomly
Number method for random sampling
Number method for random sampling
Assign numbers, use computer to generate random selection
Sample size and reliability relationship
Sample size and reliability relationship
Small samples are less reliable
How to estimate population mean from sample
How to estimate population mean from sample
Calculate the sample mean