The T distribution whose other name is also **Student T Distribution** is a probability distribution much similar to a normal distribution, the difference in these distributions is that the T distribution has a curve that is a bit short and stout. When you have less no. of samples then you use T distribution instead of normal distribution. If the no. of samples exceeds then the T distribution becomes more similar to normal distribution. Also, if the size of samples is more than 20 then the two distributions become almost the same.

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