It is similar to a bell curve, symmetric and bell shaped, but fatter at the tails.
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The Student's T- Distribution is a type of probability distribution that is theoretical and resembles a normal distribution. The Student T- Distribution differs from the normal distribution by its degrees of freedom.
No they are not the same.
Check the lecture on t distributions at StatLect. It is explained there.
It approaches a normal distribution.
standard normal is for a lot of data, a t distribution is more appropriate for smaller samples, extrapolating to a larger set.