CONFIDENCE

Returns the confidence interval for a population mean, using normal distribution.

Syntax

CONFIDENCE(α; sd; size)

α: The desired significance level, between 0 and 1. It also determines the confidence level, which equals (1 - α)*100%. Eg., 0.02

sd: The known standard deviation of a normal distribution. It must be greater than 0. Eg., 1.5

size: The size of a sample from the specified distribution. Eg., 20

Examples

Formula	Result
=CONFIDENCE(A2;B2;C2)	0.780280798
=CONFIDENCE(A3;B3;C3)	0.391992797
=CONFIDENCE(A4;B4;C4)	0.736104537

Get a hands-on experience of the function in the embedded range below.

Possible Errors

Errors	Meaning
#N/A!	The function could not find the value it was asked to look for. Commonly occurs in VLOOKUP and similar functions.
#NAME!	The function name is incorrect or invalid. The given defined name (if any) is invalid. There is a typo in the defined name used in the function. Double quotes are missing for text values in the function. Colon missing in a cell range reference.
#VALUE!	The given argument's data type is incorrect or invalid. For example, the function =DATE(A1:A3) will return a #VALUE error when a text value is present in the range.
#REF!	The given cell reference is incorrect or invalid. This error may occur when a cell/range has been deleted, moved, or pasted over.
#NUM!	The value of α is not between 0 and 1. The value of sd is less than 0. The value of size is less than 1.

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