# stats year 1

- Created by: kittytthorpe
- Created on: 06-03-20 09:41

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- Y1 STATS
- population - whole set of all the individuals
- census - measures every member of the population
- advantages - gives accurate result
- disadvantage- time consuming and expensive, cannot be used if the process destroys the item

- sample - a small portion of the population
- advantages - less time consuming/expensive, fewer people, less data to process
- disadvantage- not as accurate, sample might not be big enough to give info about small sub-groups of the population

- sampling units - individual units of population. sampling frame - individually numbered or name e.g. list

- census - measures every member of the population
- random sampling
- simple random sampling - completely random, every sample has an equal chance
- advantages - free of bias, easy and cheap
- disadvantage- not suitable when large population, sampling frame needed

- systematic - required elements chosen at regular intervals
- advantages - simple, quick, good for large populations
- disadvantage - sampling frame needed, introduce bias if sampling frame is not random

- stratified - population divided into mutually exclusive strata and random sample taken from each
- advantages - accurately reflects the population structure, gives proportional representation of groups within a population
- disadvantage - population must be clearly classified into distinct strata

- simple random sampling - completely random, every sample has an equal chance
- non random sampling
- quota sampling - select sample that reflects whole population
- advantages - allows a small sample to be representative of the whole population, no sampling frame needed
- disadvantage - can introduce bias, population must be divided into groups = costly

- opportunity - sample of people available at time
- advantages - easy to carry out, inexpensive
- disadvantage - unlikely to be representative, dependent on researcher

- quota sampling - select sample that reflects whole population

- population - whole set of all the individuals

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