Confidence Interval Calculator
CI for mean (normal).
Result
Lower bound
94.632
- Upper bound
- 105.368
Common questions
What is a confidence interval?
A confidence interval is a range of values that likely contains the true population parameter. A 95% CI means if you repeated the study 100 times, about 95 of those intervals would contain the true value.
How do I calculate a confidence interval?
CI = sample mean ± (Z-score × standard error). For 95% confidence, use Z = 1.96. Standard error = standard deviation ÷ √(sample size).