Statistical Variables - Texas Instruments TI-83 Manual Book

Statistical Variables

The statistical variables are calculated and stored as indicated below. To
access these variables for use in expressions, press , and select
. Then select the
5:Statistics
menu. If you edit a list or change the type of analysis, all statistical
VARS
variables are cleared.
Variables
mean of values
x
sum of values
x
2
sum of values
x
sample standard deviation of
population standard deviation of
number of data points
mean of values
y
sum of values
y
2
sum of values
y
sample standard deviation of
population standard deviation of
...
sum of
x y
minimum of values
x
maximum of values
x
minimum of values
y
maximum of values
y
1st quartile
median
3rd quartile
regression/fit coefficients
polynomial,
Logistic
coefficients
correlation coefficient
coefficient of determination
regression equation
summary points (
Q and Q
1 3
menu shown in the column below under
VARS
x
x
y
y
, and
SinReg
only)
Med.Med
The first quartile (
and (median). The third quartile (
minX Med
median of points between
1.Var 2.Var
Stats Stats
v v
Gx Gx
2 2
Gx Gx
Sx Sx
sx sx
n n
w
Gy
2
Gy
Sy
sy
Gxy
minX minX
maxX maxX
minY
maxY
Q
1
Med
Q
3
) is the median of points between
Q
1
and
Med maxX
Other
VARS
menu
XY
G
G
XY
XY
XY
XY
G
G
XY
XY
G
XY
XY
XY
XY
PTS
PTS
PTS
,
a b EQ
, , ,
a b c EQ
,
d e
r EQ
2 2
,
r R
EQ
RegEQ EQ
, , ,
x1 y1 x2
PTS
, ,
y2 x3 y3
) is the
Q
3
.
Statistics 12-29