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Statistics
%tw
v
u
1-VAR
analyzes statistical data from 1 data set with 1
measured variable,
x
.
2-VAR
stats analyzes paired data
from 2 data sets with 2 measured variables—
x
, the
independent variable, and
y
, the dependent variable. You
can enter up to 42 data sets.
To define statistical data points:
1. Press
%
t
. Select
1-VAR
or
2-VAR
and press
<
. The
STAT
indicator displays.
2. Press
v
.
3. Enter a value for
X
1
.
4. Press
$
.
¦
In
1-VAR
stat mode, enter the frequency of occurrence
(
FRQ
) of the data point.
FRQ
default=1. If
FRQ
=0, the
data point is ignored.
¦
In
2-VAR
stat mode, enter the value for
Y
1
and press
<
.
5. Repeat steps 3 and 4 until all data points are entered.
You must press
<
or
$
to save the last data point
or
FRQ
value entered. If you add or delete data points,
the TI-30X
Ö
automatically reorders the list.
6. When all points and frequencies are entered:
¦
Press
u
to display the menu of variables (see
table for definitions) and their current values, or
¦
Press
v
to return to the blank
STAT
screen. You
can do calculations with data variables (
Ï
,
Ð
, etc.).
Select a variable from the
u
menu and then
press
<
to evaluate the calculation.
7. When
¦
Press
%
t
and select
CLRDATA
to clear all data
points without exiting
STAT
mode, or
¦
Press
%
w
<
to clear all data points,
variable and
FRQ
values, and to exit
STAT
mode (
STAT
indicator turns off).
Variables Definition
n Number of
x
or (
x
,
y)
data points.
Ï
or
Ð
Mean of all
x
or
y
values.
Sx or Sy Sample standard deviation of
x
or
y
.
Î
x or
Î
y Population standard deviation of
x
or
y
.
Ò
x or
Ò
y Sum of all
x
or
y
values.
Ò
x
2
or
Ò
y
2
Sum of all
x
2
or
y
2
values.
Ò
xy Sum of (
x
…
y)
for all
xy
pairs.
a Linear regression slope.
b Linear regression
y
-intercept.
r Correlation coefficient.
x
¢
(
2-VAR
) Uses
a
and
b
to calculate predicted
x
value
when you input a
y
value.
y
¢
(
2-VAR
) Uses
a
and
b
to calculate predicted
y
value
when you input an
x
value.
Probability
H
nPr
Calculates the number of possible permutations
of
n
items taken
r
at a time, given
n
and
r
. The
order of objects is important, as in a race.
nCr
Calculates the number of possible combinations
of
n
items taken
r
at a time, given
n
and
r
. The
order of objects is not important, as in a hand of
cards.
!
A factorial is the product of the positive integers
from 1 to
n
.
n
must be a positive whole number
69.
RAND
Generates a random real number between 0 and
1. To control a sequence of random numbers,
store an integer (seed value)
‚
0 to rand . The
seed value changes randomly every time a
random number is generated.
RAND
[
Generates a random integer between 2 integers,
A
and
B,
where
A
{
RAND
[
{
B
. Separate the 2
integers with a comma.
Errors
ARGUMENT
— A function does not have the correct number
of arguments.
DIVIDE BY 0
—
¦
You attempted to divide by 0.
¦
In statistics, n=1.
DOMAIN
— You specified an argument to a function outside
the valid range. For example:
¦
For x
‡
: x = 0 or y < 0 and x not an odd integer.
¦
For yx: y and x = 0; y < 0 and x not an integer.
¦
For
‡
x: x < 0.
¦
For LOG or LN: x
0.
¦
For TAN: x = 90
¡
, -90
¡
, 270
¡
, -270
¡
, 450
¡
, etc.
¦
For SIN
-
1 or COS
-
1: |x| > 1.
¦
For nCr or nPr: n or r are not integers
‚
0.
¦
For x!: x is not an integer between 0 and 69.
EQUATION LENGTH ERROR
— An entry exceeds the digit
limits (88 for Entry Line and 47 for Stat or Constant Entry
lines); for example, combining an entry with a constant that
exceeds the limit.
FRQ DOMAIN
—
FRQ
value (in
1-VAR
stats) < 0 or >99, or
not an integer.
OVERFLOW
— |
q
|
‚
1
¯
10, where
q
is an angle in a trig,
hyperbolic, or R
4
Pr( function.
STAT
—
¦
Pressing
u
with no defined data points.
¦
When not in STAT mode, pressing
v
,
u
, or
%
w
.
SYNTAX
— The command contains a syntax error: entering
more than 23 pending operations or 8 pending values; or
having misplaced functions, arguments, parentheses, or
commas.
Battery Replacement
1. Using a small Phillips screwdriver, remove screws from
back case.
2. Remove protective cover. Starting from the bottom,
carefully separate front from back. Caution: Be careful
not to damage any internal parts.
3. Using a small Phillips screwdriver (if necessary),
remove old battery; replace with new one.
Caution:
Avoid contact with other TI-30X
Ö
components
while changing the battery.
4. If necessary, press
&
and
-
at the same time to
reset the TI-30X
Ö
(clears memory and all settings).
Caution: Dispose of old batteries properly. Do not
incinerate batteries or leave where a child can find them.
In Case of Difficulty
Review instructions to be certain calculations were
performed properly.
Press
&
and
-
at the same time. This clears all
memory and settings.
Check the battery to ensure that it is fresh and properly
installed.
Change the battery when:
¦ &
does not turn the unit on, or
¦
The screen goes blank, or
¦
You get unexpected results.
To continue using the TI-30X
×
S (Battery/Solar)
†
until
you can change the battery:
1. Expose the solar panel to brighter light.
2. Press
&
and
-
at the same time to reset the
calculator. This clears all settings and memory.
†
Operates in well-lit areas using solar cell. Operates in
other light settings using battery.
TI Product Service and Warranty Information
Product Support
Customers in the U.S., Canada, Puerto Rico, and the Virgin
Islands
For general questions, contact Texas Instruments Customer
Support:
phone:
1. 800. TI. CARES
(1. 800. 842. 2737)
e-mail:
ti-cares@ti.com
For technical questions, call the Programming Assistance Group of
Customer Support:
phone:
1. 972. 917. 8324
Customers outside the U.S., Canada, Puerto Rico, and the
Virgin Islands
Contact TI by e-mail or visit the TI calculator home page on the
World Wide Web.
e-mail:
ti-cares@ti.com
Internet:
www.ti.com/
calc
Product Service
Customers in the U.S. and Canada Only
Always contact Texas Instruments Customer Support before
returning a product for service.
Customers outside the U.S. and Canada
Refer to the leaflet enclosed with this product or contact your local
Texas Instruments retailer/distributor.
Other TI Products and Services
Visit the TI calculator home page on the World Wide Web.
www.ti.com/calc
Warranty Information
Customers in the U.S. and Canada Only
One-Year Limited Warranty for Electronic Product
This Texas Instruments (“TI”) electronic product warranty extends
only to the original purchaser and user of the product.
Warranty Duration.
This TI electronic product is warranted to the
original purchaser for a period of one (1) year from the original
purchase date.
Warranty Coverage.
This TI electronic product is warranted against
defective materials and construction.
THIS WARRANTY IS VOID IF
THE PRODUCT HAS BEEN DAMAGED BY ACCIDENT OR
UNREASONABLE USE, NEGLECT, IMPROPER SERVICE, OR
OTHER CAUSES NOT ARISING OUT OF DEFECTS IN
MATERIALS OR CONSTRUCTION.
Warranty Disclaimers. ANY IMPLIED WARRANTIES ARISING
OUT OF THIS SALE, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION
TO THE ABOVE ONE-YEAR PERIOD. TEXAS INSTRUMENTS
SHALL NOT BE LIABLE FOR LOSS OF USE OF THE PRODUCT
OR OTHER INCIDENTAL OR CONSEQUENTIAL COSTS,
EXPENSES, OR DAMAGES INCURRED BY THE CONSUMER OR
ANY OTHER USER.
Some states/provinces do not allow the exclusion or limitation of
implied warranties or consequential damages, so the above
limitations or exclusions may not apply to you.
Legal Remedies.
This warranty gives you specific legal rights, and
you may also have other rights that vary from state to state or
province to province.
Warranty Performance.
During the above one (1) year warranty
period, your defective product will be either repaired or replaced
with a reconditioned model of an equivalent quality (at TI’s option)
when the product is returned, postage prepaid, to Texas
Instruments Service Facility. The warranty of the repaired or
replacement unit will continue for the warranty of the original unit or
six (6) months, whichever is longer. Other than the postage
requirement, no charge will be made for such repair and/or
replacement. TI strongly recommends that you insure the product
for value prior to mailing.
Software.
Software is licensed, not sold. TI and its licensors do not
warrant that the software will be free from errors or meet your
specific requirements.
All software is provided “AS IS.”
Copyright.
The software and any documentation supplied with this
product are protected by copyright.
All Customers Outside the U.S. and Canada
For information about the length and terms of the warranty, refer to
your package and/or to the warranty statement enclosed with this
product, or contact your local Texas Instruments retailer/distributor.
