Stats & mechanics Edexcel A level
Maths Exam With Solved Solutions.
Census - Answer Every member of the population
Sample - Answer A selection of observations taken from a subset of the population which is
used to find out information about the population as a whole
Simple random sampling - Answer Random sampling- everyone the sample has a equal chance
of being selected. E.g. each person given a number and then the numbers are chosen from
random
Systematic sampling - Answer Random sampling- the required elements are chosen at regular
intervals from an ordered list. E.g. choose a number between 1-10 randomly and if you got 5,
choose every 5th person after that
Stratified sampling - Answer Random sampling- Population is in groups, and a proportional
random sample is taken for each group. The formula for choosing how many people to take
from each group (number in group)/(number in population) x overall sample size
Quota sampling - Answer Non-random- an interviewer selects a sample that reflects the
characteristics of the whole population, and keep going until they have done as much as
needed.
Opportunity sampling - Answer Non-random- taking the sample from people who are
available at the time the study is carried out and who fit the criteria
Locations in the large data set - Answer Leuchars-UK
Leeming- UK
Heathrow-UK
Hurn-UK
Camborne-UK
Jacksonville-USA
Beijing-China
Maths Exam With Solved Solutions.
Census - Answer Every member of the population
Sample - Answer A selection of observations taken from a subset of the population which is
used to find out information about the population as a whole
Simple random sampling - Answer Random sampling- everyone the sample has a equal chance
of being selected. E.g. each person given a number and then the numbers are chosen from
random
Systematic sampling - Answer Random sampling- the required elements are chosen at regular
intervals from an ordered list. E.g. choose a number between 1-10 randomly and if you got 5,
choose every 5th person after that
Stratified sampling - Answer Random sampling- Population is in groups, and a proportional
random sample is taken for each group. The formula for choosing how many people to take
from each group (number in group)/(number in population) x overall sample size
Quota sampling - Answer Non-random- an interviewer selects a sample that reflects the
characteristics of the whole population, and keep going until they have done as much as
needed.
Opportunity sampling - Answer Non-random- taking the sample from people who are
available at the time the study is carried out and who fit the criteria
Locations in the large data set - Answer Leuchars-UK
Leeming- UK
Heathrow-UK
Hurn-UK
Camborne-UK
Jacksonville-USA
Beijing-China
