Strata (Edexcel GCSE Statistics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is a 'stratum' in statistics?
What is a 'stratum' in statistics?
A group within a population
Why use stratified sampling?
Why use stratified sampling?
Ensures all groups are represented
How do you find the number of people needed from each stratum?
How do you find the number of people needed from each stratum?
Use proportional formula
In a gym with 120 males and 80 females, how many males in a 40-sample?
In a gym with 120 males and 80 females, how many males in a 40-sample?
24
For a class of 34, 28, and 18 children, how many from class C in a 20 sample?
For a class of 34, 28, and 18 children, how many from class C in a 20 sample?
4
What is the key idea behind stratified sampling?
What is the key idea behind stratified sampling?
Dividing into groups
When calculating for strata, what should you do with decimals?
When calculating for strata, what should you do with decimals?
Always round to whole number
What is a key reason for using stratified sampling instead of simple random?
What is a key reason for using stratified sampling instead of simple random?
It’s more accurate for population proportions
What must the proportions in the sample match?
What must the proportions in the sample match?
Original population ratios
What is the primary purpose of dividing a population into strata?
What is the primary purpose of dividing a population into strata?
To improve sampling accuracy