Confidence Interval Calculator
StatisticsCalculate the confidence interval for a sample mean given the sample size, mean, and standard deviation.
Lower Bound
The lower end of the confidence interval.
Margin of Error
1.960
The plus-or-minus range around your sample mean.
Upper Bound
51.96
The upper end of the confidence interval.
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Creators
Odeh Ahwal0people find this calculator helpful
Views
Helpful
Saved
Embeds
Statistics calculators
Frequently Asked Questions
What is a confidence interval?
A confidence interval is a range of values that likely contains the true population value. A 95% confidence interval means that if you repeated the study many times, 95% of the calculated intervals would contain the true mean.
How does sample size affect the confidence interval?
Larger sample sizes produce narrower, more precise confidence intervals because they reduce the standard error. Smaller samples produce wider, less precise intervals.
What confidence level should I choose?
95% is the most commonly used confidence level, balancing precision and reliability. Use 99% when errors are costly and you need extra certainty.
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