Student’s t Distribution
						q For variable t q The probability density function for the t-distribution is: q Here K(n) is a constant which depends on the number of degree of freedom (n = n-1). K(n) is chosen so that:
		q As the sample size (n) increases, the t-distribution approaches the normal distribution. q Unlike the normal distribution, the t-distribution depends on sample size. Its tails get longer with smaller n.