Difference between revisions of "Documentation/How Tos/Calc: CONFIDENCE function"
From Apache OpenOffice Wiki
< Documentation | How Tos
(Initial content) |
(→See also:) |
||
| Line 25: | Line 25: | ||
[[Documentation/How_Tos/Calc: Statistical functions|'''Statistical functions''']] | [[Documentation/How_Tos/Calc: Statistical functions|'''Statistical functions''']] | ||
| + | |||
| + | [[Documentation/How_Tos/Calc: Functions listed alphabetically|'''Functions listed alphabetically''']], | ||
| + | [[Documentation/How_Tos/Calc: Functions listed by category|'''Functions listed by category''']] | ||
Revision as of 14:00, 13 September 2008
CONFIDENCE
Returns a confidence interval.
Syntax:
CONFIDENCE(α; sd; size)
- sd (> 0) is the (known) standard deviation of a normal distribution.
- size is the size of a sample from that distribution.
- α is the significance level (0 < α < 1), which determines the desired confidence level = (1 - α)*100%. Thus for example α = 0.05 gives a 95% confidence level.
- CONFIDENCE returns a value that when added and subtracted from the sample mean gives an interval within which the population mean is expected to lie with the specified confidence level.
- CONFIDENCE calculates NORMINV(1 - α/2; 1; 0) * sd / √(size)
Example:
CONFIDENCE(0.05;1;20)
- returns approximately 0.438. With a 95% confidence level, the mean of the entire population lies within ±0.438 of the sample mean.
See also:
Functions listed alphabetically, Functions listed by category
