What is Statistical Significance? Complete Guide to P-Values, Confidence & Data Reliability

What is Statistical Significance?

Statistical significance indicates whether the results of a study are likely to reflect a real effect rather than random chance. It’s a key concept in validating scientific findings.

Key Terms

• P-Value: The probability that results occurred by chance. A p-value below 0.05 usually means the results are statistically significant.
• Confidence Level: Indicates how sure we are about the result, often set at 95%.
• Effect Size: Describes the strength or magnitude of the relationship between variables.

Why It Matters

• Helps determine if results are trustworthy.
• Supports or rejects research hypotheses.
• Guides decision-making in scientific studies.

Summary

Statistical significance helps researchers separate meaningful findings from random noise. It ensures that scientific conclusions are backed by evidence, not coincidence.