Two-way tables (Edexcel GCSE Statistics): Flashcards
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Practise the cards
7 cards from this deck
What is the main purpose of stratified sampling?
What is the main purpose of stratified sampling?
To ensure each subgroup is proportionally represented in the sample.
How do you calculate the proportion of a stratum?
How do you calculate the proportion of a stratum?
Divide the number in the stratum by the total population size.
Why is stratified sampling more reliable?
Why is stratified sampling more reliable?
It produces samples that better represent the whole population.
How does two-way table make stratified sampling systematic?
How does two-way table make stratified sampling systematic?
Each cell is a distinct stratum, simplifying proportional sampling.
Proportion: under25 females 1543 of 11270?
Proportion: under25 females 1543 of 11270?
0.137 (≈13.7%)
What proportion are 25+ females?
What proportion are 25+ females?
0.449 (5060/11270)
25+ females 5060 of 11270, sample 120 → how many?
25+ females 5060 of 11270, sample 120 → how many?
54 people (5060/11270×120=53.87→54)