To show causality, researchers must use a/an ______________ study design. Experimental Observational Cohort Case-con

1. To show causality, researchers must use a/an ______________ study design.

Experimental

Observational

Cohort

Case-control

Cross-sectional

2. The Texas Men's Health Study enrolled 38,649 men in 1999 and collected exposure and lifestyle information to assess the relationship between these factors and subsequent occurrence of heart disease, is an example of which type of study?

Experimental study

Observational study

Cohort study

Case study

Cross-sectional study

3. Clinical trials occur under very specialized, controlled conditions that do not represent everyday life. Generalizing the results obtained in this environment to populations not engaged in the research is a concern for this type of study.