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