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HP HP-11C User Manual

HP HP-11C
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62
Section
3:
Numeric
Functions
3.
The
standard
deviation
of
the
y
values
(s,)
is
calculated
using
the
statistical
data
accumulated
in
registers
R
(3y?),
R3(Zy),
and
Ry(n)
according
to
the
formula
shown
above.
The
resultant
value
for
s,
is
available
in
the
Y-register.
Example.
Calculate
the
standard
deviation
for
the
corrected
coal
production
and
electrical
output
accumulations used
in
the
previous
examples.
Keystrokes
Display
(s
0.4287
Standard
deviation
of
electrical
output
(X-
register
inputs)
for
the
five-year
period.
x=y
0.0800
Standard
deviation
of
coal
production
(Y-register
inputs)
for
the
five-year
period.
Retain
the
preceding
statistics
in
your
HP-11C
for
use
in
the
next
example.
When
your
data
constitutes
not
just
a
sample
of
a
population
but
rather
all
of
the
population,
the
standard
deviation
of
the
data
is
the
true
population
standard
deviation
(denoted
o).
The
formula
for
the
true
population
standard
deviation
differs
by
a
factor
of
[(n
—
1)/n]%
from
the
formula
used
for
the
(s]
function.
The
difference
between
the
values
is
small,
and
for
most
applications
can
be
ignored.
Nevertheless,
if
you
want
to
calculate
the
exact
value
of
the
population
standard
deviation
for
an
entire
population,
you can
easily
do
so
with
just
a
few
keystrokes
on
your
HP-11C.
Simply
add,
using
the
key,
the
mean
(%)
of
the
data
to
the
data
and
then
press
(s].
The
result
will
be
the
true
population
standard
deviation
of
the
original
data.

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HP HP-11C Specifications

General IconGeneral
BrandHP
ModelHP-11C
CategoryCalculator
LanguageEnglish

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