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vekshin1
3 years ago
9

A study which reviews the traffic video of an intersection during rush hour to determine how many people

SAT
1 answer:
telo118 [61]3 years ago
5 0

Answer:

The correct option is;

D) Observational study

Explanation:

In an observational study, the researcher observes, notes and record the an occurrence of events which are due to the existence of a condition, test, risk factor, such that the experimental units are apparently out of the control of the researcher, or there are no researcher intervention in the study, due to either physical constraint or laid down ethics.

In the question, the researcher observes to determine the the number of people that run a light through pre recorded traffic video providing a physical restraint which makes it an observational study.

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The statements describing the southern economy in the antebellum era include 'it was primarily agricultural', 'it relied heavily on slave labor' and 'it produced mostly cotton and tobacco', It was a primary economy.

<h3>The southern economy in the antebellum era</h3>

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This economy was characterized by the presence of slaves in the southern states and the family-farm of the free states.

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Learn more about the antebellum era here:

brainly.com/question/8379433

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