Weaken the Conclusion about Studying at Night

Very Easy Critical Reasoning Strengthening Data Arguments

A recent study showed that students who study late at night score higher on math tests than those who study in the morning. The researchers concluded that studying at night leads to better performance in math.

Which of the following, if true, would most seriously weaken the researchers' conclusion?

Many students prefer studying at night because their schedules are busier during the day.

The tests were administered at different times of day, making comparisons difficult.

Students who score high in math often study at night.

Most students report feeling more alert and focused when studying at night.

Hint

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