AP Statistics / Unit 1: Exploring One-Variable Data and Collecting Data

1.11 Random Sampling

3 practice questions

Notes

Simple random sample (SRS): every group of $n$ has an equal chance.
Stratified: split into similar groups (strata), sample from each.
Cluster: split into groups, randomly pick whole groups.
Systematic: every $k$th individual from a random start.

Practice

Randomly choosing 5 homerooms and surveying everyone in them:

Randomly picking 20 students from each grade level:

Stratified sampling is useful when:

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