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Chapter 1: Q31BB (page 1)

In Exercises 29–32, indicate whether the observational study used is cross-sectional, retrospective, or prospective.

Marijuana Study Researchers from the National Institutes of Health want to determine the current rates of marijuana consumption among adults living in states that have legalized the use of marijuana. They conduct a survey of 500 adults in those states.

Short Answer

Expert verified

This is a cross-sectional observational study.

Step by step solution

01

Given information

To determine the current level of marijuana consumption, a survey is conducted with 500 adults.

02

Types of observational studies

A type of observational study that deals with a single current time-point is referred to as across-sectional study.

A type of observational study that deals with values observed in a period that occurred in the past for the analysis of a current study is referred to as aretrospective study.

A type of observational study that deals with values that are to be observed for a long period that would continue in the future is referred to as aprospective study.

03

Identification of the type of study

For the survey to determine the “current level of consumption” of marijuana, the researcher needs to collect data on 500 adults.

Here, the marijuana consumption rates are to be determined for the current time-point by surveying a total of 500 adults, so this is a cross-sectional study.

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