The CONFIDENCE.T function calculates the width of half the confidence interval for a student’s t-distribution.
Parts of a CONFIDENCE.T function
CONFIDENCE.T(alpha, standard_deviation, size)
| Part | Description |
|---|---|
alpha | One minus the desired confidence level. E.g. 0.1for 0.9, or 90%, confidence. |
standard_deviation | The standard deviation of the population. |
size | The size of the population. |
Note
CONFIDENCE.T calculates the width of half the confidence interval such that a value picked at random from the data set has 1-alpha probability of lying within the mean plus or minus the result of CONFIDENCE.T.
Examples
| A | B | C | D | E | F |
|---|---|---|---|---|---|
| 1 | Alpha | STDEV | size | Result | Formula |
| 2 | 0.05 | 6.43 | 27 | 2.56340262541175 | =CONFIDENCE.T(A2,B2,C2) |
Related functions
- CONFIDENCE.NORM: Calculates the width of half the confidence interval for a normal distribution.