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Specific
Features
of the
HP-33E
21
Keystrokes
5
IBm
... I
31E
9
lam ...
1
slE
I
OCt.
I
2
loeLI
3
loeLI4
Mean
Display
5_0000
2_0000
9.0000
3.0000
3.0000
16.0000
98.0000
21.0000
155.0000
122.0000
Second pair
is
accumulated
;
n
=
2.
Third pair
is
accumulated;
n
=
3.
Number of entries from
R
2 ,
(
n
~
3).
Sum
of x values in
R
3 .
Sum
of squares of x values
in
~
.
Sum
of y values
in
R~.
Sum
of squares
of
y
values
in
R
6 •
Sum
of
products of
x
and
y
va lues
in R
7
.
The
00
function is
used
to calculate
the mean
(arithmetic average)
of
x
and
y
values accumulated in
the
statistical registers.
When
you
press
(j] [!)
:
1.
The mean
of x
is
calculated
using the data
accumu
lated in the
registers
that
contain
n
and
~x
(R2 and
R!l)'
The resultant
value
for
the mean
of x
is
placed
in
the di
splay and the
X-reg
ister.
2.
The
mean
of
y
is
calculated
usi
ng the data
accumulated
in the
registers
that
contain
nand ly
(R2
and
Rs).
The resultant value
for mean of
y is
placed
in the V-regi ster. Simply
press
1;0;:11 to
bring
that
va
lue
into
the
X-register
for
use.
The easiest way
to
accumulate
the data
required
for the
00
function
is
by
usi
ng the
IEJ
function
as
described
above.
Standard Deviation
The
[!)
function
is
used
to
calculate the sample standard
deviation (a
measure of dispersion around
the mean)
of data accumulated
in the
stati stical
registers.
When
you press
[!)[!)
:
J.
The
sample standard
deviation of x is
calc
ulated using data
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