7th Grade · Statistics & Probability
Sample
7.SP.A.1
Definition
A subset of the population selected for study. Used to make inferences about the population when studying everyone is impractical. Quality depends on size and selection method.
Examples
- 600 students total; a sample of 60 students is 10% of the population.
- 45 of 60 sampled (75%) prefer lunch period A → estimate 75% of 600 = 450 students overall.
Key rule
A good sample is random and representative of the population.
Memory hook
A smaller group standing in for the whole.