The statement that best represents a conclusion for the investigation is that students who spend less time studying after school get lower math grades.
What are conclusions?
Conclusions represent the last stage of scientific investigations. Conclusions are logically drawn from observations made during investigations.
The conclusions to be drawn, however, will depend on the aim and objectives of the investigation.
In this case, the aim is to investigate factors that affect students' math grades. Thus, all the available options that identify math grades as the dependent variable are applicable.
However, the only statement that is all-encompassing is the one that says students who spend less time studying after school get lower math grades.
More on research investigations can be found here: https://brainly.com/question/27180587
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