example digits=2: (0.001234 => 0.0012)

degrees of freedom

Choose X or P(x≤X)

Message

T-student distribution is an artificial distribution used for a normally distributed population when we don't know the population's standard deviation or when the sample size is too small.

T distribution looks similar to the normal distribution but lower in the middle and with thicker tails. The shape depends on the degrees of freedom, number of independent observations, usually number of observations minus one (n-1). The higher the degree of freedom the more it resembles the normal distribution.