CONFIDENCE.T functionThe 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. 0.1 for 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
Confidence Interval (Supposed Mean=40)
2
0.05
6.43
27
2.56340262541175
=CONFIDENCE.T(A2,B2,C2)
[40-2.563, 40+2.563]
Related functions
CONFIDENCE.NORM: Calculates the width of half the confidence interval for a normal distribution.