Confidence Interval Calculator

Enter the sample mean, standard deviation, sample size, and confidence level to calculate the confidence interval. Shows the margin of error and the upper and lower bounds.

Inputs

Sample Mean

Standard Deviation

Sample Size (n)

Confidence Level

Results

Lower Bound

46.4215

Upper Bound

53.5785

Margin of Error

± 3.5785

Standard Error

1.8257

Z-Value

1.960

Last updated: April 16, 2026

Frequently Asked Questions

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