7th Grade · Statistics & Probability
Estimate
7.SP.A.2
Definition
A prediction of a population value based on sample data. Calculated by applying the sample statistic to the population size. Larger, random samples produce more accurate estimates.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- 40 of 50 surveyed prefer pizza (80%); estimate for 600 students = 0.80 × 600 = 480.
- Sample average height 64 in estimates the population average as about 64 in.
Key rule
A larger, representative sample gives a more accurate estimate.
Memory hook
Use the sample percentage to predict the whole group.