CONFIDENCE.T function

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. 0.1 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.
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