Difficulty: Medium

Average Score: 68%

Which topic would be appropriate for an observational study?

Rationale

Determining how wind direction affects the size of a sand dune.

This topic is suitable for an observational study as it involves directly observing and measuring natural phenomena without manipulating variables. By examining how wind direction influences dune size, researchers can gather data in real-world settings to identify patterns and correlations.

A (Modeling the flooding caused by a potential hurricane) YOUR ANSWER

This choice involves creating a simulation or model based on theoretical data and equations, rather than conducting direct observations of a natural event. Observational studies focus on gathering data from real-world observations rather than predictive modeling.

B (Comparing how fast different colors of light travel through glass) YOUR ANSWER

This option suggests a laboratory experiment where variables can be controlled and manipulated, such as light source and glass type. An observational study would not typically involve controlled experiments; it is more focused on collecting data from natural occurrences.

C (Analyzing the masses of salt crystals grown under different conditions) YOUR ANSWER

This scenario describes an experimental setup where conditions can be varied to observe their effects, which is characteristic of laboratory experiments rather than observational studies. Observational studies aim to record data without altering the environment or conditions.

D (Determining how wind direction affects the size of a sand dune) CORRECT

This is the only choice that allows for the collection of data through direct observations in a natural environment. By observing how sand dunes evolve in response to varying wind directions, researchers can identify trends and relationships without influencing the variables themselves.

Conclusion

Observational studies are best suited for collecting data from natural settings without manipulation. The relationship between wind direction and dune size exemplifies this approach, as it allows researchers to document changes in a natural context. In contrast, the other options involve controlled experiments or modeling, which fall outside the realm of observational study methodologies.

Related Questions

View all