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📏 Confidence Interval Calculator

Calculate the confidence interval for a sample mean given standard deviation and sample size.

What is a Confidence Interval?

A confidence interval gives a range of values that is likely to contain the true population parameter. For example, a 95% confidence interval means that if you repeated the sampling many times, about 95% of the intervals would contain the true population mean. Wider intervals provide more certainty but less precision.

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