© 1999
T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X ÙS: A Guide For Teachers
75
Statistics
12
Keys
1.
%
t
displays a menu from which you
can select
1-VAR,
2-VAR
or
CLRDATA
.
1-VAR
Analyzes data from 1 set
of data with 1 measured
variable—
x
.
2-VAR
A
nalyzes paired data from
2 sets of data with 2
measured variables—
x
, the
independent variable, and
y
, the dependent variable.
CLRDATA
Clears data values without
exiting
STAT
mode.
2.
v
lets you enter data points (
x
for
1-VAR
stats;
x
and
y
for
2-VAR
stats).
3.
%
w
displays the following menu
that lets you clear data values and exit
STAT
mode.
EXIT ST: Y N
•
Press
<
when
Y
(yes) is
underlined to clear data values and
exit
STAT
mode.
•
Press
<
when
N
(no) is
underlined to return to the previous
screen without exiting
STAT
mode.
4.
u
displays the menu of variables
with their current values.
n
Number of
x
(or
x
,
y
) data
points.
v
or
w
Mean of all
x
or
y
values.
Sx
or
Sy
Sample standard deviation
of
x
or
y.
sx
or
sy
Population standard
deviation of
x
or
y
.
Gx
or
Gy
Sum of all
x
values or
y
values.
Gx
2
or
Gy
2
Sum of all
x
2
values or
y
2
values.
Gxy
Sum of (
x
Q
y)
for all
xy
pairs in 2 lists.
a
Linear regression slope.
b
Linear regression
y-intercept.
r
Correlation coefficient.
Notes
•
The examples on the transparency masters
assume all default settings.
•
To save the last data point or frequency
value entered, you must press
<
or
$
.
•
You can change data points once they are
entered.
3
2
1
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