Stats & mechanics edexcel a level
maths Exam Questions and Answers
(Most Recent Version, Complete Study
Census - CORRECT ANSWERS Every member of the population
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
Simple random sampling - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS Leuchars-UK
, Leeming- UK
Heathrow-UK
Hurn-UK
Camborne-UK
Jacksonville-USA
Beijing-China
Perth-Australia
What is measured in the large data set - CORRECT ANSWERS Daily mean temperature
Daily total rainfall
Daily total sunshine
Daily mean wind direction&speed
Daily maximum gust
Daily maximum relative humidity
Daily mean cloud cover
Daily mean visibility
Daily mean pressure
Mode/modal class - CORRECT ANSWERS the value that comes up most often
Median - CORRECT ANSWERS The middle value when they are in order
Mean - CORRECT ANSWERS Sum of all the values divided by the number of values
Lower quartile - CORRECT ANSWERS 25% of the way through the data
maths Exam Questions and Answers
(Most Recent Version, Complete Study
Census - CORRECT ANSWERS Every member of the population
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
Simple random sampling - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS Leuchars-UK
, Leeming- UK
Heathrow-UK
Hurn-UK
Camborne-UK
Jacksonville-USA
Beijing-China
Perth-Australia
What is measured in the large data set - CORRECT ANSWERS Daily mean temperature
Daily total rainfall
Daily total sunshine
Daily mean wind direction&speed
Daily maximum gust
Daily maximum relative humidity
Daily mean cloud cover
Daily mean visibility
Daily mean pressure
Mode/modal class - CORRECT ANSWERS the value that comes up most often
Median - CORRECT ANSWERS The middle value when they are in order
Mean - CORRECT ANSWERS Sum of all the values divided by the number of values
Lower quartile - CORRECT ANSWERS 25% of the way through the data
