© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X
Ù
S: A Guide For Teachers
A-5
Quick Reference to Keys
( C o n t i n u e d )
A
Key
Function
u
Displays the following menu of stat 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
x2
or
G
y2
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.
L
Displays the following menu of variables.
A B C D E
Lets you select a variable in which to store the
displayed value. The new variable replaces any
previously stored value.
rand
Lets you set a seed value for random integers.
@
Calculates the tangent.
%
\
Calculates the inverse tangent.
