Two-way tables (AQA GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
What is a stratum in stratified sampling?
What is a stratum in stratified sampling?
A distinct subgroup within your population.
How do you calculate the total population size?
How do you calculate the total population size?
Add all values in the two-way table.
What formula finds the proportion of a stratum?
What formula finds the proportion of a stratum?
Proportion = Size of stratum / Total population size.
How to calculate sample size for a stratum?
How to calculate sample size for a stratum?
Sample size = (Stratum proportion) × (Total sample size)
What to do if the sample size is too small?
What to do if the sample size is too small?
Consider increasing the sample size for better accuracy.
Why use two-way tables for stratified sampling?
Why use two-way tables for stratified sampling?
They divide the population into distinct, non-overlapping groups.
What factors influence sample size determination?
What factors influence sample size determination?
Population size, margin of error, and confidence level.
What is the formula for stratified sampling size?
What is the formula for stratified sampling size?
Sample size = (stratum size/total population) x total sample size.
How to ensure proportional representation in sampling?
How to ensure proportional representation in sampling?
Match sample proportions to those in the population.
Calculate sample size for child females: 30/170*50?
Calculate sample size for child females: 30/170*50?
Sample size = 9 (rounded from 8.82).