To evaluate the safety and tolerability of a new drug in humans.

To determine the efficacy of a new drug in treating a specific disease.

To compare the effectiveness of a new drug to an existing treatment.

To assess the long-term side effects of a new drug.

Food and Drug Administration (FDA)

Centers for Disease Control and Prevention (CDC)

National Institutes of Health (NIH)

Environmental Protection Agency (EPA)

To compare the effectiveness of a new drug to an existing treatment.

To assess the long-term side effects of a new drug.

To evaluate the safety and tolerability of a new drug in humans.

To determine the efficacy of a new drug in treating a specific disease.

Clinical trials are conducted in a controlled environment, while observational studies are conducted in a natural setting.

Clinical trials are conducted to test the effectiveness of a new treatment, while observational studies are conducted to identify risk factors for a disease.

Clinical trials involve the randomization of participants, while observational studies do not.

All of the above.

Phase I, Phase II, and Phase III

Phase I, Phase II, and Phase IV

Phase II, Phase III, and Phase IV

Phase III, Phase IV, and Phase V

To evaluate the safety and tolerability of a new drug in humans.

To determine the efficacy of a new drug in treating a specific disease.

To compare the effectiveness of a new drug to an existing treatment.

To assess the long-term side effects of a new drug.

To evaluate the safety and tolerability of a new drug in humans.

To determine the efficacy of a new drug in treating a specific disease.

To compare the effectiveness of a new drug to an existing treatment.

To assess the long-term side effects of a new drug.

To evaluate the safety and tolerability of a new drug in humans.

To determine the efficacy of a new drug in treating a specific disease.

To compare the effectiveness of a new drug to an existing treatment.

To assess the long-term side effects of a new drug.

To review and approve clinical trial protocols.

To monitor the conduct of clinical trials.

To protect the rights and welfare of human subjects.

All of the above.

RCTs involve the randomization of participants, while NRCTs do not.

RCTs are more expensive than NRCTs.

RCTs are more difficult to conduct than NRCTs.

All of the above.

To combine the results of multiple studies to provide a more precise estimate of the effect of a treatment.

To identify risk factors for a disease.

To compare the effectiveness of different treatments.

To assess the long-term side effects of a treatment.

Clinical trials involve multiple participants, while case studies involve a single participant.

Clinical trials are conducted in a controlled environment, while case studies are conducted in a natural setting.

Clinical trials are designed to test the effectiveness of a treatment, while case studies are designed to identify risk factors for a disease.

All of the above.

Cohort studies follow participants over time, while case-control studies compare participants who have a disease to participants who do not.

Cohort studies are more expensive than case-control studies.

Cohort studies are more difficult to conduct than case-control studies.

All of the above.

Cross-sectional studies collect data from a single point in time, while longitudinal studies collect data over time.

Cross-sectional studies are more expensive than longitudinal studies.

Cross-sectional studies are more difficult to conduct than longitudinal studies.

All of the above.

Qualitative studies collect non-numerical data, while quantitative studies collect numerical data.

Qualitative studies are more expensive than quantitative studies.

Qualitative studies are more difficult to conduct than quantitative studies.

All of the above.