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.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
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.