CONFIDENCE.NORM function
Returns the confidence interval for a population mean, using a normal distribution.
Syntax
CONFIDENCE.NORM(alpha, standard_dev, size)Square brackets indicate optional arguments.
Arguments
| Argument | Required | Meaning |
|---|---|---|
| alpha | Yes | The significance level used to compute the confidence level. The confidence level equals 100*(1 - alpha)%, or in other words, an alpha of 0.05 indicates a 95 percent confidence level.0.05 |
| standard_dev | Yes | The population standard deviation for the data range and is assumed to be known.2.5 |
| size | Yes | The sample size.50 |
Try CONFIDENCE.NORM
Calculate a normal confidence margin for a mean
=CONFIDENCE.NORM(A2,B2,C2)This returns the margin of error, not a lower or upper limit: z(0.975)*2/SQRT(100), about 0.392. A confidence interval for a mean also needs the sample mean and appropriate sampling assumptions.
Inspect the current formula
Read its written arguments or observe actual operation values in a separate local calculation. This action neither applies a draft nor grades an answer.
Read the formula, one argument at a time
Explore the written function calls and their inputs. The calculation result belongs to the complete formula.
CONFIDENCE.NORM · top-level call
=CONFIDENCE.NORM(A2,B2,C2)1 / 3 · alpha
The significance level used to compute the confidence level. The confidence level equals 100*(1 - alpha)%, or in other words, an alpha of 0.05 indicates a 95 percent confidence level.
CONFIDENCE.NORM reference ↗Follow the cells behind a result
Read explicit local references and helper formulas using a separate calculation. Your draft stays in this field; the worksheet and practice checks do not change.
The worksheet runs locally. Published checks apply to the supplied example only. Native Excel and Google Sheets compatibility remain unverified.
Reference and compatibility
Univer 1.0.4 / Apache-2.0. Calculation checks cover the supplied examples only. The browser worksheet does not implement every Excel feature, external service or connected data type.