HP 38g Graphing Calculator - Manual (Page 58)

Probability
Functions Probability functions are often used in statistical analyses.
COMB Number of combinations (without regard to order) of
n
things
taken rat a time, n!/(r!(n-r)).
COMB
(n,r)
! Factorial of a positive integer. For non-integers, ! = F(x + 1).
value
!
PERM Number of permutations (with regard to order) of
n
things
taken rat a time,
n\/ (_n-r)\.
PERM(n,r)
RANDOM Random number (between zero and 1). Produced by a pseudo­
random number sequence. Becomes the seed for the next
random number.You can set the seed using the command
RANDSEED.
RANDOM
UTPC Upper-Tail Chi-Squared Probability given
degrees
of freedom,
evaluated at
value.
Returns the probablility that a random
variable is greater than
value.
UTPC (
degrees, value )
UTPF Upper-Tail Snedecor’s F Probability given numerator degrees of
freedom and
denominator
degrees of freedom (of the F
distribution), evaluated at
value.
Returns the probability that a
Snedecor's F random variable is greater than
value.
UTPF
{numerator, denominator, value)
UTPN Upper-Tail Normal Probability given
mean
and
variance,
evaluated at
value.
Returns the probability that a normal
random variable is greater than
value
for a normal distribution.
(The variance is the square of the standard deviation.)
UTPN (
mean, variance, value
)
UTPT Upper-Tail Student's t Probability given
degrees
of freedom,
evaluated at
value.
Returns the probability that the Student's t
random variable is greater than
value.
UTPT (
degrees, value )
2-22 Mathematical Calculations