Common Core: S-IC.1
Problem 16 of 45s12-016
A school has 40 homerooms of about 25 students each. The principal randomly picks 4 homerooms and surveys every student in them. What kind of sample is this?
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Solution walkthrough1:40
- The population is about 1,000 students, already split into 40 homerooms of about 25 students each.
- Step one: pick 4 homerooms at random. Step two: survey every student in those 4 rooms.
- Whole groups picked at random, and everyone in them surveyed: that is a cluster sample.
- Stratified: a few from every room. Simple random: any 100 students. Systematic: every 10th on a list.
- Traps: stratified samples from every group, simple random ignores groups, and convenience uses no chance.