What is an example of strong evidence in scientific research?

Meta-analysis is considered an example of strong evidence in scientific research because it combines the findings from multiple studies to provide a more comprehensive understanding of a specific phenomenon or question. This approach significantly enhances the reliability of the results because it aggregates data across various populations, methodologies, and contexts, thereby increasing the overall sample size and statistical power.

By synthesizing evidence from different studies, meta-analyses can identify patterns, reveal inconsistencies, and produce more generalized conclusions. This makes them particularly valuable for guiding clinical practice and informing public health policies, as they help establish more robust evidence-based guidelines. In contrast, other research forms like case studies, individual experiments, or survey research may be limited by smaller sample sizes or potential biases, making them less comprehensive in contributing to the overall body of scientific knowledge.