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HP HP-11C User Manual

HP HP-11C
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Section
3:
Numeric
Functions
61
The
illustration
below
shows
what
happens
in
the
stack
when
you
execute
(assumes
stack
disabled,
as
it
would
be
following
a
operation):
lost
/
BN
lost
Retain
the
preceding
statistics
in
your
HP-11C
for
use
in
the
next
example.
Standard
Deviation
Pressing
(s]
computes
the
standard
deviation
(a
measure
of
dispersion
around
the
mean)
of
the
accumulated
statistics
data.
The
formulas
used
by
the
HP-11C
to
compute
s,,
the
standard
deviation
of
the
accumulated
x
values,
and
s,,
the
standard
deviation
of
the
accumulated
y
values
are:
nyx2—(Sx)2
_
\,
nsy?—(3y)?
n(n—1)
n(n—1)
These
formulas
give the
best
estimates
of
the
population
standard
deviations
from
the
sample
data.
Consequently,
the
standard
deviation
given
by
these
formulas
is
termed
by
convention
the
sample
standard
deviation.
When
you
press
[g](s]:
1.
The
contents
of
the
stack
registers
are
lifted
in
the
same
way
as
they
are
when
you
press
(Z+],
as
described
on page
57.
2.
The
standard
deviation
of
the
x
values
(s,)
is
calculated
using
the
data
accumulated
in
registers
R,
(3x2),
R,
(3x),
and
R,
(n)
according
to
the
formula
shown
above.
The
resultant
value
for s,
is
placed
in
the
X-register.

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HP HP-11C Specifications

General IconGeneral
BrandHP
ModelHP-11C
CategoryCalculator
LanguageEnglish

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