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HP HP-67 - Page 118

HP HP-67
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114
Function
Keys
2.
Sample
y
standard
deviation
(sy)
is
calculated
using
the
data
accumulated
in
storage
registers
Rg;
(2y?),
Rgg
(2y),
and
Rgg
(n)
according
to
the
formula:
The
resultant
value
for
standard
deviation
of
y
(sy)
is
available
in
the
Y-register
of
the
stack.
Thus,
with
data
first
accumulated
in
secondary
storage
registers
Rgy,
through
Rgg,
when
you
press
)
(5],
the
contents
of
the
stack
registers
are
changed...
...from
this...
...to
this.
T
t
—_—
t
T
Zz
z
—_—
z
Zz
Y
vy
—»Jost
Sy
Y
X
X
sx
X
-
\h—>@
LAST
X
To
use
the
value
for
standard
deviation
of y
(sy)
simply
use
the
key
to
bring
that
value
into
the
displayed
X-register
of
the
stack.
Example:
In
a
recent
survey
to
deter-
mine
the
age
and
net
worth
(in
millions
of
dollars)
of
six
of
the
50
wealthiest
persons
in
the
United
States,
the
fol-
lowing
data
were
obtained
(sampled).
Calculate
the
average
age
and
net
worth
of
the
sample,
and
calculate
the
standard
deviations
for
these
two
sets
of
data.

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