15. A medicinal study finds a strong correlation between increasing drug dose and decreasing tumor size. However, the study design was purely observational. What is the critical biostatistical caution when interpreting this finding?

  • Correlation implies causation.
  • The correlation is likely due to chance.
  • Correlation does not imply causation; confounding or other factors may be at play.
  • The study was poorly designed.
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