68
The estimate of
y
f
or a giv
en
x
(estimate
y
´) and the estimate
of
x
f
or a giv
en
y
(estimate
x
´) can also be f
ound.
When there
are tw
o
x
v
alues
, the
COMP
symbol will appear
. Press
@
to
s
witch betw
een
x
v
alues
.
Exponential regression,
logarithmic regression,
po
w-
er regression,
and in
ver
se regression calculations
Section
and
results
, e
xcept f
or coeffi
cients
c
.
The estimate of
y
f
or a giv
en
x
(estimate
y
´) and the estimate
of
x
f
or a giv
en
y
(estimate
x
´) can also be f
ound.
Because the
calculator con
v
e
rts each f
o
rm
ula into a linear reg
ression bef
ore
actual calculation tak
es place
, it obtains all statistics — e
xcept
coeffi
cients
a
and
b
— from con
v
e
rted data r
ather than from
entered data.
V
ariab
les
Content
①
n
Number of samples
x
Mean of samples (
x
v
alues)
sx
Sample standard de
viation (
x
v
alues)
x
P
opulation standard de
viation (
x
v
alues)
x
Sum of samples (
x
v
alues)
x
2
Sum of squares of samples (
x
v
alues)
②
y
Mean of samples (
y
v
alues)
sy
Sample standard de
viation (
y
v
alues)
y
P
opulation standard de
viation (
y
v
alues)
y
Sum of samples (
y
v
alues)
y
2
Sum of squares of samples (
y
v
alues)
xy
Sum of products of samples (
x
,
y
)
a
Coeffi
cient of reg
ression equation
b
Coeffi
cient of reg
ression equation
c
Coeffi
cient of quadr
atic reg
ression equation
r
Correlation coeffi
cient
• Use
i
or
f
to perf
or
m a v
a
riab
le calculation in ST
A
T
mode
.
5 Statistical Calculations.indd 68
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