In order to study the seriousness of drinking and driving, a researcher obtains records from past car

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In order to study the seriousness of drinking and driving, a researcher obtains records from past car crashes. Drivers are partitioned into a group that had no alcohol consumption and another group that did have evidence of alcohol consumption at the time of the crash.

Indicate whether the observational study used is cross-sectional, retrospective, or prospective.

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