Exam (elaborations) Edexcel AS Level Further Mathematics (Statistics)

, Population - CORRECT ANSWERS-The whole set of items that are of interest

Census - CORRECT ANSWERS-Observes or measures every member of a population

Advantages of a census - CORRECT ANSWERS-It should give a completely accurate
result

Disadvantage of a census - CORRECT ANSWERS-Time consuming and expensive
Hard to process large quantity of data

Sample - CORRECT ANSWERS-A selection of observations taken from a subset of the
population which is used to find out information about the population as a whole

Advantages of a sample - CORRECT ANSWERS-Less time consuming
Fewer people have to respond
Less data than a census

Disadvantage of a sample - CORRECT ANSWERS-The data may not be as accurate
The data may not be large enough toggle information about the population

Sampling Units - CORRECT ANSWERS-Individual units of a population

Sampling Frame - CORRECT ANSWERS-A list of individually named or numbered
sampling units

Simple Random Sample - CORRECT ANSWERS-A sample where every sampling unit
has an equal chance of being chosen

Advantages of Simple Random Sample - CORRECT ANSWERS-Free of bias
Easy and cheap to implement
Each sampling unit has equal chance of selection

Disadvantage of Simple Random Sample - CORRECT ANSWERS-A sampling frame is
needed
Not suitable when the population size is very big

Systematic Sampling - CORRECT ANSWERS-A method of sampling where the
required elements are chosen at regular intervals from an ordered list

Advantages of Systematic Sampling - CORRECT ANSWERS-Simple and quick to use
Suitable for large samples

Disadvantages of Systematic Sampling - CORRECT ANSWERS-A sampling frame is
needed
It can introduce bias if sampling frame is not random