👥 样本量计算器Sample Size Calculator
计算调查所需样本量：置信水平、误差范围、预期比例和总体规模（有限总体修正）。Survey sample size from confidence level, margin of error, expected proportion and population size.
使用说明与常见问题How-to & FAQ
「样本量计算器」是什么？What is the Sample Size Calculator?
计算调查所需样本量：置信水平、误差范围、预期比例和总体规模（有限总体修正）。Survey sample size from confidence level, margin of error, expected proportion and population size.
如何使用「样本量计算器」？How do I use the Sample Size Calculator?
在「样本量计算器」中，填写「置信水平」、「误差范围%」、「预期比例%」、「总体规模(可选)」等参数，结果会随输入实时计算并显示在下方。In the Sample Size Calculator: Fill in "Confidence", "Margin of error %", "Proportion %", "Population (optional)"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「样本量计算器」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 Sample Size Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「样本量计算器」免费吗？需要注册吗？Is the Sample Size Calculator free? Do I need an account?
「样本量计算器」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 Sample Size 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.