Why and how to use stratified sampling 3 minute maths. Sampling mathematics alevel revision revision maths. Stratified random sampling is a method of sampling that involves the division of a population into smaller groups known as strata. Jenny is carrying out a survey for her gcse mathematics project. However, it is important that a sample is representative of the population.
Obviously we cant ask everyone in the country, so we ask a sample. Stratified sampling stratum is another word for class, level or grade. Random and stratified sampling questions, worksheets. Stratified sampling higher collecting data gcse maths revision. Stratified sampling practice questions corbettmaths. Aug 27, 2012 the corbettmaths video tutorial on stratified sampling. Edexcel gcse mathematics linear 1ma0 stratified sampling materials required for examination items included with question papers ruler graduated in centimetres and nil millimetres, protractor, compasses, pen, hb pencil, eraser.
Stratified sampling changing the subject of formula even ones with reciprocals. Stratified sampling is a sampling technique that preserves the given strata proportions. Work out the number of year girls that should be in the sample. Total 662 total 220 162 382 country number of stamps france germany spain 8 italy 95 245 184 chris takes a sample of 50 stamps stratified by country. Gcse maths revision stratified sampling teaching resources.
If the groups are of different sizes, the number of items selected from each group will be proportional. He uses a sample of 50 students, stratified by year group and gender. Corbettmaths videos, worksheets, 5aday and much more. Sampling is the process of looking at a small selection of peopleobjects from a wider population in order to learn new information about that population.
For example, suppose you want to know about reading habits in the uk. Jul 29, 2010 the topic of sampling from the year 9 book of the mathematics enhancement program. Click here to try the quick test stratified sampling. A sample is a method of survey that takes a representative of the population.
Passing gcse maths significantly increases your career opportunities by helping you gain a place on a college course, apprenticeship or even landing continue reading. A worksheet and exam style practice questions covering gcse stratified sampling. New grade 91 gcse maths edexcel revision question cards higher. To do this, you might ask 500 people from the uk how many books they finished last year this is a sample. Stratified sampling for gcse maths coursework help. Stratified sampling higher collecting data ccea gcse.
Calculate the number of people that should be sampled from each age. Work out the number of students in the sample who arc malc and in the first. And thats where these cgp revision question cards come in. Stratified sampling 1 stratified sampling can be used when the population can be split into distinct groups. Stratified sampling is a method we can use to make our sample more representative. Samples are then pulled from these strata, and analysis is performed to make inferences about the greater population of interest.
The population is classified by age as shown in the table below. The examples are quick and concise with exam style questions, go to gcse maths if. Several boxes of apples are undergoing a quality check. Random and stratified sampling this lesson can be used for revision for the higher maths gcse. New gcse statistics edexcel revision guide for the grade. Taking a few apples from each box to examine is the most convenient way. Stratified random sampling requires more administrative works as compared with simple. Gcse revision video 31 stratified sampling youtube. Andrew is going to carry out a survey of these students. When considering a particular population it is usually advisable to. If you really want to make sure you know gcse maths, reading through your study notes just isnt enough youll need to test yourself. Stratified sampling for gcse maths coursework help hello all, the data i am using was collected online using a reaction timmer game. The examples are quick and concise with exam style questions, go to gcse maths if you need more indepth explanations.
Stratified sampling is a method of sampling which selects a sample from each layer of a population, sized according to how big that layer is. If the groups are of different sizes, the number of items selected from each. Gcse revision video 31 stratified sampling duration. Stratified sampling is when the population can be classified into groups or strata. By separating the population into groups age groups, genders, etc. Sampling gcserevision, maths, handlingdatastatistics. Sampling techniques include simple random sampling, systematic sampling, stratified sampling, opportunity sampling and quota sampling.
For example, how do you compare your score in a maths mock exam to your. Stratified sampling gcse maths revision video youtube. Stratified sampling questions worksheets and revision mme. Sampling alevel maths statistics revision, topics include. Everyday low prices and free delivery on eligible orders. Apr 23, 2019 sampling techniques include simple random sampling, systematic sampling, stratified sampling, opportunity sampling and quota sampling. The revise gcse revision planner helps you to plan and organise your time, stepbystep, throughout your gcse revision. Stratified sampling is used to select a sample that is representative of different groups. When a population is divided up into groups, taking a stratified sample ensures that each group is asked in the correct proportion. Lesson includes definition and builds the difficulty of examples which my class found insightful. This video also includes looking at the difference between a.
Stratified sampling made easy your free online maths tutor. Data collection and sampling revision cards teachit maths stratified sampling gcse questions parking permits stratified sampling student sheet, notes, slides nuffield foundation. This is a website which cointains a stratified sampling calculator to save you time from having to do the maths. What topics are in 2019 gcse ocr maths non calculator edexcel maths exam edexcel maths. Mathematics linear 1ma0 stratified sampling 3 minute maths. It might be a group of people or it could be simply a group of numbers. Gcse grade boundaries leaks grade boundaries for edexcel gcse maths november 2019 foundation. New grade 91 gcse maths edexcel revision question cards. For example, we might want to find out how people are going to vote at the next election.
There are 95 cards in the pack, covering every key grade 91 edexcel higher topic. A useful revision guide to the different methods of collecting data, such as tallying, questionnaires, grouping, stratified random sampling, for gcse maths. She takes a random sample of 70 students stratified by year and by gender. Lesson includes definition and builds the difficulty of examples which my class found. Organise prepare revise pearson edexcel gcse 91 statistics. Maths revision video and notes on the topic of stratified sampling. The topic of sampling from the year 9 book of the mathematics enhancement program.
It is an easy to use stratified sampling calculator which only requires minum data input. A population is a group that we want to find information about. The concept of having a representative leads to random sampling. Gcse maths revision past papers worksheets online tests. A gcse maths worksheet covering stratified sampling suitable for gcse students sitting the 9 1, alevel maths students revision and some. Stratified sampling 396, 397 histograms 442, 443 probability from a table 351, 352, 353. Stratified random sampling ensures that no any section of the population are underrepresented or overrepresented. See more ideas about gcse math, math and gcse revision. Gcse statistics revision notes collecting data sample this is. Introduction and sampling scool, the revision website. Each one starts off with quick questions to warm you up, followed by harder questions to get your brain into. Revision aids a variety of revision aids and materials to support exam preparation.
Groups include age,gender, left handed or right handed and an average reaction time for both hands. The stratified sampling calculator was developed by jacob cons. Checking all the apples piece by piece will be timeconsuming. Mar 31, 2018 gcse revision video 31 stratified sampling duration. Sampling basically means selecting peopleobjects from a population in order to test the population for something. Buy new gcse statistics edexcel revision guide for the grade 91 course with online edition cgp gcse statistics 91 revision by cgp books, cgp books isbn. Sampling, systematic sampling, stratified sampling and quota sampling. Previous rounding highest lowest practice questions.
As this method provides greater precision, greater level of accuracy can be achieved even by using small size of samples. Alevel maths statistics revision looking at sampling. Complete stratified sampling lesson made for my year 10, top set, gcse class. I know i need to take a stratified sample but im really not sure where to begin. Stratified sampling gcse maths revision video duration. Free taster packs english ks3 english key stage 4gcse english maths ks3 maths ks4gcse maths ks5 maths science. A teacher wants a sample of 50 people from a school. Use this book and wall chart to mastermind your revision. Simple random sampling a selection process where each member of the population has an equal chance of being selected. Stratified sampling worksheet and exam practice qs. An example will help understand stratified sampling better. This can be done in various ways for example by simply picking out of a hat or by using a random number generator on a calculator.
This means that the conditions have been set up and controlled by the researchers in an artificial environment i. If i actually pass my maths gcse it will be because of you, thank you. Gcse maths edexcel foundation paper 1 21st may 2019 walkthrough and solutions duration. Gcse maths 91 non calculator topic list edexel gcse maths exams procedures. Want to download the sampling revision notes in pdf format.
Topics include populations, census, sample surveys, sampling units, sampling frames, random sampling, systematic sampling, stratified sampling and quota sampling. Sampling revision maths maths gcse and alevel revision. Stratified sampling male 399 252 female 602 198 the table gives information about the numbers of students in the two years of a college course. The corbettmaths video tutorial on stratified sampling. Data stratified sampling the table shows information about chris collection of 662 stamps. For information about these resources and an index for the whole collect. Random and stratified sampling questions, worksheets, videos. Random sampling random sampling is a method that, in a population, every element has a chance to be included in a sample. A useful revision guide to the different methods of collecting data, such as tallying, questionnaires, grouping, stratifiedrandom sampling, for gcse maths. Stratified sample where the data sampled is in proportion to the population. If the groups are of different sizes, the number of items selected from. She uses a stratified sample of 60 students according to year group. Taking a few apples from each box to examine is the most read more sampling statistics. Gcse 91 statistics revision guide revise pearson edexcel gcse 91 statistics revision guide revise pearson edexcel gcse 91 statistics revision guide our revision resources are the smart choice for those revising for pearson edexcel gcse 91 statistics.
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