Statistical Calculations
126
If
BEST FIT
is selected, the 10bII+ calculates the best fit when
\Z
,
\W
, or
\T
is pressed. When selected,
BEST FIT
flashes briefly, followed by the chosen fit. The
selected regression will remain set until a new one is selected, or the statistics memory is
cleared.
When the statistics memory is cleared using
\t
, the current regression model is set
back to
LINEAR
.
Probability Calculations
In many probability calculations, specific methods of counting possible outcomes are required
as part of a process to determine the likelihood of certain results. The three main operations
that allow this are:
Factorial
Factorial
(
!
) is a mathematical operator that instructs you to multiply the current number by all
previous whole numbers. Writing out so many numbers can be cumbersome, so
mathematicians use
!
to signify this process. For example:
5
!
is equivalent to 5
x
4
x
3
x
2
x
1 = 120.
On the 10bII+, the input value
n
must be within -253 <
n
< 253. The gamma function is used
to calculate
n
! for non-integer or negative values.
Permutations
The
n
Pr function calculates the number of different arrangements, or permutations, of
n
items
taken
r
at a time. No item can occur more than once in a set of
r
items, and different orders
of the same
r
items are counted separately. This is calculated using the formula:
•
!
factorial
•
n
P
r
permutations
•
n
C
r
combinations
PERMUTATIONS
n
!
n r
–
(
)
!
------------------
=
Содержание 10bII+
Страница 1: ...i HP 10bII Financial Calculator User s Guide HP Part Number NW239 90001 Edition 1 May 2010 ...
Страница 3: ...iii HP 10bII Financial Calculator ...
Страница 30: ...At a Glance 22 ...
Страница 144: ...Statistical Calculations 136 ...
Страница 183: ...Warranty Regulatory and Contact Information 9 ...
Страница 184: ...Warranty Regulatory and Contact Information 10 ...