# Talk:Documentation/Calc Functions/T.DIST

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## SF comments

- (1) Summary. I do not think that “left tailed” has much meaning when calculating the PDF or CDF. Suggest the following re-word – “Calculates values for either the probability density function or the cumulative distribution function of the Student's t-distribution (often known more simply as just the t-distribution). The Student's t-distribution is often used to test a hypothesis about a population’s mean when the population’s standard deviation is not known. The Student’s t-distribution can be used with any statistic whose distribution is approximately normal.”.
- (2) Returns. As far as I can tell, the PDF values go from 0 to 0.4, while the CDF values go from 0 to 1. Suggest the following re-word – “Returns a real number which is a value from the probability density function (range 0 to 0.4 exclusive) or the cumulative distribution function (range 0 to 1 exclusive) of the specified Student's t-distribution”.
- (3) Arguments, 1st paragraph. Insert “Student’s” before “t-distribution” (for consistency) and insert “to be” before “calculated”.
- (4) Arguments, 2nd paragraph. Suggest the following change for clarification – replace “for the t-distribution” with “of the sample for the Student’s t-distribution. This is typically assumed to be the number of samples minus 1.”
- (5) Additional details. Is there some reason why this section has not been populated with equations and a link to Wikipedia?

--Stevefanning (talk) 2020-11-07T15:04:44 (UTC)