CONFIDENCE function
Returns the confidence interval for a population mean, using a normal distribution.
Syntax
CONFIDENCE(alpha, standard_dev, size)Square brackets indicate optional arguments.
Arguments
| Argument | Required | Meaning |
|---|---|---|
| alpha | Yes | Required. 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 | Required. The population standard deviation for the data range and is assumed to be known.2.5 |
| size | Yes | Required. The sample size.50 |
Try CONFIDENCE
Read the legacy CONFIDENCE function name
=CONFIDENCE(A2,B2,C2)CONFIDENCE is the compatibility name corresponding to CONFIDENCE.NORM. 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. Use the modern name when creating a new formula; the old spelling is useful when reading existing workbooks.
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CONFIDENCE · top-level call
=CONFIDENCE(A2,B2,C2)1 / 3 · alpha
Required. 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.
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