Stats & mechanics Edexcel A level Maths Exam with Verified Answers

Stats & mechanics Edexcel A level Maths Exam with Verified Answers Census Correct Answer Every member of the population Sample Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct Answer 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 Answer 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