User manual

© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X ÙS: A Guide for Teachers
75
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.
s
x
or
s
y
Population standard
deviation of
x or y .
G
x
or
G
y
Sum of all
x values or y
values.
G
x
2
or
G
y
2
Sum of all x
2
values or y
2
values.
G
xy
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.
Statistics
3
2
1
4
12