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Answer :
Observational study: Checking police department records to determine stolen vehicle types.
Experimental study: Surveying college students on sleep hours per night.
Experimental study: Surveying college statistics students on study hours per week.
Observational study: Asking park visitors about daily dog-walking minutes.
The examples provided can be categorized as follows:
Observational study:
- In a large city, a researcher decides to check the police department records for 2 months to determine what types of vehicles were stolen.
- In a public park, visitors were asked how many minutes a day they walked their dogs.
Experimental study:
- A survey of college students was taken to see how many hours a student sleeps per night.
- A survey of students enrolled in a college statistics course was taken to see how many hours per week a student studies.
Observational study: In both examples, the researcher collects data without intervening or manipulating variables. In the first example, the researcher analyzes existing police records to determine the types of stolen vehicles. In the second example, visitors in a public park are asked about the duration of their dog walks. The researcher observes and records the information without influencing or altering the participants' behavior.
Experimental study: In both examples, the researcher collects data by surveying participants. In the first survey, college students are asked about their sleep duration per night. In the second survey, students in a statistics course are asked about their weekly study hours. The researcher is actively collecting data by manipulating the variables of interest and surveying the participants.
These categorizations help differentiate between studies where researchers passively observe existing data and studies where researchers actively intervene and manipulate variables to collect data.
The probable question maybe:
Categories the following example as Observational / Experimental study.
- In a large city, a researcher decides to check the police department records for 2 months to determine what types of vehicles were stolen.
- A survey of college students was taken to see how many hours a student sleeps per night.
- A survey of students enrolled in a college statistics course was taken to see how many hours per week a student studies.
- In a public park, visitors were asked how many minutes a day they walked their dogs.
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