AP Statistics / Unit 1: Exploring One-Variable Data and Collecting Data
1.10 The Investigative Question Revisited and Data Collection
Notes
- Observational study: observe without assigning treatments. Can show association, not causation.
- Experiment: assign treatments. With random assignment, can show cause and effect.
- Census: data from the whole population. Sample survey: data from part of it.
Practice
Researchers record what people eat and their health, without intervening. This is:
No treatments are assigned.
Only a well-designed experiment can show:
Random assignment balances other variables.
Collecting data from every student in a school is a:
The whole population.
Ready for more? Take the Unit 1 test.