Difficulty: Hard

Average Score: 33%

Which question would be appropriate for an observational study?

Rationale

What is the brightest star that can be seen from Earth?

Observational studies focus on collecting data through observation rather than manipulation. Asking about the brightest star visible from Earth allows researchers to gather information based on direct observations without experimental interference.

A (Which type of glass best resists scratching?) YOUR ANSWER

This question implies a need for experimentation to determine which type of glass is most scratch-resistant, likely involving controlled testing and comparisons. Such experimental conditions do not align with the principles of an observational study, which relies on naturally occurring phenomena.

B (Which type of rock dissolves fastest when exposed to acid rain?) YOUR ANSWER

Similar to choice A, this question necessitates experimental conditions to observe the rate of dissolution of different rock types. Conducting tests on rocks in acid rain would be an experimental approach rather than an observational study, as it involves manipulation of variables.

C (What is the brightest star that can be seen from Earth?) CORRECT

This question is best suited for an observational study, as it relies on direct observation of stars in the night sky. Researchers can collect data on brightness without needing to manipulate any variables, perfectly aligning with the observational study's framework.

D (How does the mass of a toy car affect how fast it rolls down a track?) YOUR ANSWER

This question implies a causal relationship and requires experimentation to measure the effect of mass on speed. The experimental nature of this inquiry diverges from the observational study format, which is focused on non-manipulative data collection.

Conclusion

Observational studies are characterized by the collection of data through observation without altering the environment or conditions. The question regarding the brightest star visible from Earth exemplifies this method, as it involves gathering observable data. In contrast, the other options necessitate experimental manipulation, making them unsuitable for observational studies.

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