关于本计算器
A confidence interval calculator builds the range mean ± z·σ/√n for 90, 95 or 99% confidence from sample statistics.
置信区间计算器
均值置信区间与误差范围。
输入计算参数
计算结果摘要
置信区间[94.63231894, 105.3676811]95% (z = 1.96)
误差范围± 5.367681064
SE2.738612788
常见问题
What does 95% mean?
About 95 of 100 such intervals from repeated sampling would contain the true mean.
Why does n matter?
The standard error σ/√n shrinks with sample size, so larger samples give narrower intervals.
z or t?
This tool uses z critical values (1.645/1.96/2.576); for tiny samples with estimated σ, t-intervals are slightly wider.