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ConfidenceT

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Returns the size of a confidence interval for the mean of a sample, using a Student’s t distribution, i.e. returns:

 

 

where ,  is the inverse cumulative distribution function for the Student’s t distribution with  degrees of freedom,  is the standard deviation and  is the sample size.

 

Provided for compatibility with the CONFIDENCE.T function in Microsoft Excel and some other spreadsheet packages. Please note that the Nematrian function accepts non-integral values of  (these can arise if observations are given different weights).

 

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