57. Which question would be appropriate for an observational study?
Answer: C
What is the brightest star that can be seen from Earth?
This question is appropriate for an observational study as it requires collecting data based on direct observations of celestial bodies without manipulating any variables.
A) Which type of glass best resists scratching?
This question would not suit an observational study since it implies a comparative analysis that requires experimental testing to evaluate the scratch resistance of different glass types under controlled conditions.
B) Which type of rock dissolves fastest when exposed to acid rain?
Similar to option A, this question suggests a need for experimental observations to determine the rate of dissolution, making it unsuitable for an observational study that focuses on natural phenomena without interference.
C) What is the brightest star that can be seen from Earth?
This question is ideal for an observational study, as it can be answered through direct observation of the night sky, allowing researchers to document the brightness of stars based on their visibility from Earth without any manipulation or experimental setup.
D) How does the mass of a toy car affect how fast it rolls down a track?
This question is not appropriate for an observational study because it involves an experimental setup where variables such as mass need to be manipulated to observe the effect on speed, rather than simply observing existing conditions.
Conclusion
The question regarding the brightest star visible from Earth is the only option that aligns with the principles of an observational study, as it relies solely on observation without any experimental manipulation. In contrast, the other questions require controlled experiments to derive their answers, thus disqualifying them from being suitable for observational study methods.