Questions: Researchers wanted to determine if having a television (TV) in the bedroom is associated with obesity. The researchers administered a questionnaire to 373 twelve-year-old adolescents. After analyzing the results, the researchers determined that the body mass index of the adolescents who had a TV in their bedroom was significantly higher than that of the adolescents who did not have a TV in their bedroom. Complete parts (a) through (e). (a) Why is this an observational study? What type of observational study is this? Why is this an observational study? A. This is an observational study because the researchers observe the behavior of the individuals in the study without trying to influence an explanatory variable of the study. B. This is an observational study because the researchers try to influence the outcome of the study. C. It is not an observational study. What type of observational study is this? A. Cross-sectional study B. Case-control study C. Cohort study

Researchers wanted to determine if having a television (TV) in the bedroom is associated with obesity. The researchers administered a questionnaire to 373 twelve-year-old adolescents. After analyzing the results, the researchers determined that the body mass index of the adolescents who had a TV in their bedroom was significantly higher than that of the adolescents who did not have a TV in their bedroom. Complete parts (a) through (e). (a) Why is this an observational study? What type of observational study is this? Why is this an observational study? A. This is an observational study because the researchers observe the behavior of the individuals in the study without trying to influence an explanatory variable of the study. B. This is an observational study because the researchers try to influence the outcome of the study. C. It is not an observational study. What type of observational study is this? A. Cross-sectional study B. Case-control study C. Cohort study
Transcript text: Researchers wanted to determine if having a television (TV) in the bedroom is associated with obesity. The researchers administered a questionnaire to 373 twelve-year-old adolescents. After analyzing the results, the researchers determined that the body mass index of the adolescents who had a TV in their bedroom was significantly higher than that of the adolescents who did not have a TV in their bedroom. Complete parts (a) through (e). (a) Why is this an observational study? What type of observational study is this? Why is this an observational study? A. This is an observational study because the researchers observe the behavior of the individuals in the study without trying to influence an explanatory variable of the study. B. This is an observational study because the researchers try to influence the outcome of the study. 15 question C. It is not an observational study. What type of observational study is this? A. Cross-sectional study B. Case-control study C. Cohort study
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Solution

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Solution Steps

Solution Approach

To determine why this is an observational study, we need to identify whether the researchers are merely observing the participants without intervention. For the type of observational study, we need to classify it based on the study design: cross-sectional, case-control, or cohort.

Step 1: Reason for Observational Study

This study is classified as an observational study because the researchers observe the behavior of the individuals without attempting to influence any explanatory variables. In mathematical terms, this can be expressed as:

\[ \text{Observational Study} \implies \text{No Influence on Explanatory Variables} \]

Step 2: Type of Observational Study

The type of observational study conducted here is a cross-sectional study. This means that the researchers collected data at a single point in time to analyze the relationship between having a TV in the bedroom and the body mass index (BMI) of the adolescents. This can be represented as:

\[ \text{Cross-Sectional Study} \implies \text{Data Collected at One Point in Time} \]

Final Answer

The reason this is an observational study is:

\(\boxed{\text{A. This is an observational study because the researchers observe the behavior of the individuals in the study without trying to influence an explanatory variable of the study.}}\)

The type of observational study is:

\(\boxed{\text{A. Cross-sectional study}}\)

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