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Types of studies

AP.STATS: DAT‑2 (EU), DAT‑2.A (LO), DAT‑2.A.3 (EK), DAT‑2.A.4 (EK) CCSS.Math: HSS.IC.B.3


Grace was curious if married people were more likely to be safe drivers than unmarried people.
Grace took a random sample of car accident records from the past 5 years in her country, and she calculated what percent of accidents in the sample were caused by married people. She compared that result with the percentage of all drivers in the country that were married during that time period.
What type of observational study is this?
Choose 1 answer: