qFor variable t
q
q
qThe probability density function for the t-distribution is:
q
q
qHere K(n) is a constant which depends on the number of degree of freedom (n = n-1). K(n) is chosen so that:
q
qAs the
sample size (n) increases, the t-distribution approaches the normal
distribution.
qUnlike
the normal distribution, the t-distribution
depends on sample size. Its tails get longer with
smaller n.