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HP HP-20S - Calculating the Population Standard Deviation

HP HP-20S
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Calculate
the
mean
and
standard
deviation
of
the
times.
Also,
calcu-
late
the
root
mean
square,
using
the
formula
\/Zx?/n
.
Keys:
()
(cLz]
45
4
2
3.25
3.5
3.75
()
53]
(]
(5x.8y]
(RCL]
7
(=](RcL]
4
=10=]
Display:
0.0000
1.0000
6.0000
3.5000
0.8515
77.1250
6.0000
3.5853
Description:
Clears the
statistical
registers.
Enters
the
first
time.
Enters
the
remaining
data.
Calculates
the
mean.
Calculates
the
standard
deviation.
Displays
Zx2.
Displays
n.
Calculates
the
root
mean
square.
Calculating
the
Population
Standard
Devia-
tion
The
standard
deviations
calculated
by
(]
and
(]
)
are
the
sample
standard
deviations.
They
assume
that
the
data
is
a
sampling
of
a
larger,
com-
plete
set
of
data.
If
the
data
constitutes
the
entire
population
of
data,
the
true
population
standard
deviation
can
be
calculated
by
calculating
the
mean
of
the
original
data,
adding
the
mean
to
the
statistical
data
using
(2+],
and
then
cal-
culating
the
standard
deviation.
For
two-variable
statistics,
after
calculating
the
mean
of
the
original
data,
press
[R)
to
put
the
data
in
the
proper
order
(y
in
the
display)
then
press
[Z+].
5:
Statistical
Calculations
55

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