Sampling (Leaving Cert Mathematics): Flashcards
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Practise the cards
13 cards from this deck
Definition of population in statistics
Definition of population in statistics
Everything/everybody that could possibly be involved in a particular investigation or study
Definition of sample in statistics
Definition of sample in statistics
Group selected from population to collect data
Purpose of a sample
Purpose of a sample
To collect data from part of population and draw conclusions about the whole
Problem with too small a sample
Problem with too small a sample
Results may not be reliable or representative
Problem with too large a sample
Problem with too large a sample
Data takes too long to collect and analyse
Definition of bias in sampling
Definition of bias in sampling
Sample not properly selected; results distorted & unrepresentative
Bias source: non-representative location
Bias source: non-representative location
Sampling location/method favours certain types of people
Bias source: incorrect population
Bias source: incorrect population
Sample doesn't include all relevant groups
Bias source: survey non-response
Bias source: survey non-response
Respondents may not represent whole population surveyed
Bias source: dishonest answers
Bias source: dishonest answers
People provide untruthful responses, skewing results
Definition of simple random sample
Definition of simple random sample
Every population member has equal chance of selection
Why simple random sampling avoids bias
Why simple random sampling avoids bias
Gives every member equal chance of being selected
Three methods to select random samples
Three methods to select random samples
Hat method, random number table, random number generator