HP 49g+, Руководство пользователя, Страница: 565 / 862

Page 17-16
For the normal, Student’s t, Chi-square (
χ 2
), and F distributions, which are
represented by functions UTPN, UTPT, UPTC, and UTPF in the calculator, the
inverse cuff can be found by solving one of the following equations:
•
Normal, p = 1 – UTPN(
µ
,
σ
2,x)
•
Student’s t, p = 1 – UTPT(
ν
,t)
•
Chi-square, p = 1 – UTPC(
ν
,x)
•
F distribution: p = 1 – UTPF(
ν
N,
ν
D,F)
Notice that the second parameter in the UTPN function is
σ
2, not
σ 2
,
representing the variance of the distribution. Also, the symbol
ν
(the lower-
case Greek letter no) is not available in the calculator. You can use, for
example,
γ
(gamma) instead of
ν
. The letter
γ
is available thought the
character set (
‚±
).
For example, to obtain the value of x for a normal distribution, with
µ
= 10,
σ
2
= 2, with p = 0.25, store the equation ‘
p=1-UTPN( µ , σ 2,x)
’ into
variable EQ (figure in the left-hand side below). Then, launch the numerical
solver, to get the input form in the right-hand side figure:
The next step is to enter the values of
µ
,
σ 2
, and p, and solve for x:
This input form can be used to solve for any of the four variables involved in
the equation for the normal distribution.