7th Grade · Statistics & Probability
Inference
7.SP.A.1
Definition
A conclusion about a population drawn from sample data. Valid inferences require a random, representative sample. The inference is an estimate subject to sampling variability.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- 50 students surveyed, 60% prefer math; estimate for all 500 students ≈ 300 prefer math.
- A non-random sample can produce a biased inference.
Key rule
The larger and more representative the sample, the more reliable the inference.
Memory hook
Use the sample to make a best guess about everyone.