📏 置信区间计算器Confidence Interval Calculator
根据样本均值、标准差和样本量计算均值的置信区间（使用 t 分布）。Confidence interval for a mean from sample mean, standard deviation and size (Student's t-distribution).
使用说明与常见问题How-to & FAQ
「置信区间计算器」是什么？What is the Confidence Interval Calculator?
根据样本均值、标准差和样本量计算均值的置信区间（使用 t 分布）。Confidence interval for a mean from sample mean, standard deviation and size (Student's t-distribution).
如何使用「置信区间计算器」？How do I use the Confidence Interval Calculator?
在「置信区间计算器」中，填写「样本均值」、「样本标准差」、「样本量」、「置信水平」等参数，结果会随输入实时计算并显示在下方。In the Confidence Interval Calculator: Fill in "Sample mean", "Sample SD", "Sample size", "Confidence"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「置信区间计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Confidence Interval Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「置信区间计算器」免费吗？需要注册吗？Is the Confidence Interval Calculator free? Do I need an account?
「置信区间计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Confidence Interval Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.