When the number of degrees of freedom is large, the student's t distribution is close to normal distribution.
About normal distribution
A data collection with a normal distribution is put up so that the majority of the values clustered in the center of the range and the remaining values taper off symmetrically in either direction.
A straightforward example of something with a normal distribution pattern is height: The majority of people are of the average height, the proportions of taller and shorter persons are nearly equal, and a very small proportion of people are either extraordinarily tall or extremely short.
To know more about the normal distribution:
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