Question

A group of researchers carried out a study to determine which type of portable water purification system is the most effective. Throughout the study, they used water from a variety of lakes in the region.

Which conclusion could be reported based on this study?

A.
The study will produce results regarding the effect of the portable water purification systems only on lake water in that region.
B.
The portable water purification system that is found to be the most effective will work for all bodies of water.
C.
The portable water purification system that is found to be the most effective will work only for lake water.
D.
The study is inherently biased, and no results can be reported.

Answer 1

What do you think the answer is and why?

Answer 2

old question, will answer so this can be closed

B.
The portable water purification system that is found to be the most effective will work for all bodies of water. ---> false, as there is no evidence that these results are generalizable to all bodies of water

C.
The portable water purification system that is found to be the most effective will work only for lake water. ---> false. on the other hand, there's no eidence that it *won't* be generalizable. they would need to repeat the experiment, but w/ other water types.

D.
The study is inherently biased, and no results can be reported. ---> false. they can still report on what they found.

A.
The study will produce results regarding the effect of the portable water purification systems only on lake water in that region. ---> true. they only studied lake water, and thus can only report on the results on lake water.