# CONFIDENCE.NORM

Formulas / CONFIDENCE.NORM
Calculate a confidence interval for a population mean using a normal distribution.
`=CONFIDENCE.NORM(alpha, standard_dev, size)`
• alpha - the significance level used to calculate the confidence level
• standard_dev - the standard deviation for the data set
• size - the sample size

## Examples

• `=CONFIDENCE.NORM(A2:A4, 0.95)`

The CONFIDENCE.NORM function computes a confidence interval for the population mean based on a sample of data.

## Summary

The CONFIDENCE.NORM function calculates a confidence interval for a population mean using a normal distribution. As an example, it can be used to estimate the probability of the next package taking a delivery time within the confidence interval.

• The CONFIDENCE.NORM function calculates a confidence interval for a population mean, which is a range of values that includes the population mean and is the sample mean plus one standard deviation.
• The CONFIDENCE.NORM function uses a normal distribution to calculate the confidence interval.