Normal/t-distribution Probabilities

Test Distribution:
Normal Distribution
t-Distribution with degrees of freedom

Standard deviation:

P(x < )
P(x > )
P( < x < )
Inverse probability:
P(x < ??)=
P(x > ??)=

Note: This creates the graph based on the shape of the normal curve, which is a reasonable approximation to the t-distribution for a large sample size. The probabilities are accurate, but the graphs are not accurate if you are doing a t-distribution with small sample size (less than 30).