GCSE Statistics Verified Solutions
Population ️️A collection of all the items
Sample ️️A selection of the population to use data from
Census ️️When data is taken from every member in the population
Advantages of a census over a sample ️️More representative, less biased, incl...
Sample ✔️✔️A selection of the population to use data from
Census ✔️✔️When data is taken from every member in the population
Advantages of a census over a sample ✔️✔️More representative, less biased, includes everyone's
opinions
Advantages of a sample over a census ✔️✔️Quicker, cheaper, easier to analyse as less data
Disadvantages of a census over a sample ✔️✔️Time consuming, expensive, difficult to do
Disadvantages of a sample over a census ✔️✔️Less representative, possibly biased
Pilot Study ✔️✔️A small scale replica of the survey to be carried out.
Advantages of a pilot study ✔️✔️Ensures questions can be understood, identify ambiguity, test
response rate, identifies likely responses, check methods
Sampling Frame ✔️✔️A list containing data that a sample can be taken from
Examples of a sampling frame ✔️✔️Electoral role, SIMS register, DVLA, telephone directory
Primary Data ✔️✔️Data that has been collected by the person doing the survey
, Secondary data ✔️✔️Data that hasn't been collected by the person doing the survey
Advantages of primary data ✔️✔️More reliable, up-to-date, tailored for investigation
Advantages of secondary data ✔️✔️Easier to obtain, cheaper, less time-consuming
Continuous Data ✔️✔️Data that lies on a continuous scale (can be at any point on a number line)
Discrete Data ✔️✔️Data that consists of separate numbers (jumps along the number line)
Quantitative Data ✔️✔️Data that has numerical values
Qualitative Data ✔️✔️Data that is not numerical values
Open Questions ✔️✔️Has no suggested answers and has freeform boxes to reply in
Advantages of open questions ✔️✔️Allows for a range of responses, so can cover all eventualities
Closed Questions ✔️✔️Has a set of answers for the person to choose from
Advantages of closed questions ✔️✔️Easier to analyse as range of responses restricted
Leading Questions ✔️✔️Questions that infer an opinion and promote a certain answer
Convenience Sample ✔️✔️The first so many pieces of data in the list are sampled
Advantages of a convenience sample ✔️✔️Quick and easy
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