79. A large cross-sectional study finds a strong correlation between lack of sleep and poor academic performance among college students. What critical limitation exists in inferring causation?
A.
The study was too small.
B.
The temporal sequence between lack of sleep and poor performance cannot be established.
✓
C.
Students were not randomized.
D.
The study was too expensive.
📖 Additional Information
The study was too small.
The temporal sequence between lack of sleep and poor performance cannot be established.
