CONFIDENCE.T Function (DAX)
Returns the confidence interval for a population mean, using a Student's t distribution.
CONFIDENCE.T(alpha,standard_dev,size)
Parameters
| Term | Definition |
|---|---|
| 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. |
| standard_dev | The population standard deviation for the data range and is assumed to be known. |
| size | The sample size. |
Returns the confidence interval for a population mean, using a Student's t distribution.
If any argument is nonnumeric, CONFIDENCE.T returns the #VALUE! error value.
If alpha ≤ 0 or alpha ≥ 1, CONFIDENCE.T returns the #NUM! error value.
If standard_dev ≤ 0, CONFIDENCE.T returns the #NUM! error value.
If size is not an integer, it is rounded.
If size equals 1, CONFIDENCE.T returns #DIV/0! error value.
| Formula | Description | Result |
|---|---|---|
| =CONFIDENCE.T(0.05,1,50) | Confidence interval for the mean of a population based on a sample size of 50, with a 5% significance level and a standard deviation of 1. This is based on a Student's t-distribution. | 0.284196855 |
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