Texas Instruments TI - 40 Benutzerhandbuch

-3-

¦ 

In 

 stat mode, enter the frequency of occurrence

(

) of the data point. 

 default=1. If 

, the data

point is ignored.

¦ 

In 

 stat mode, enter the value for 

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

 value entered. If you add or delete data points, the

TI

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 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 

-

 to return to the blank 

 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 finished:

¦ 

Press 

%

 

t

 and select 

 to clear all data

points 

without exiting 

 mode, or

¦ 

Press 

%

 

w

 

<

 to clear all data points,

variable and 

 values, and to exit 

 mode (

indicator turns off).

Number of 

 or 

 data points.

Ï

 or 

Ð

Mean of all 

 or 

 values.

Sx or Sy

Sample standard deviation of 

 or 

.

x or 

Population standard deviation of 

 or 

.

Ò

x or 

Ò

Sum of all 

 or 

 values.

Ò

 or 

Ò

Sum of all 

 or 

 values.

Ò

Sum of 

…

 for all 

 pairs.

Linear regression slope.

Linear regression 

-intercept.

Correlation coefficient.

Uses a and b to calculate predicted X value
when you input a Y value.

 (

Uses a and b to calculate predicted Y value
when you input an X value.

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.

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 

. 

 must be a positive whole

number 



 69.

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.

[

Generates a random integer between 2
integers, 

A and B, where A 

{

 

[

{

 

B.

Separate the 2 integers with a comma.

 — A function does not have the correct number of

arguments.

 — 

¦ 

You attempted to divide by 0.

¦ 

In statistics, n=1.

 — You specified an argument to a function outside

the valid range. For example:

¦ 

For x

‡

: 

x = 0 or y < 0 and 

 not an odd integer.

¦ 

For 

y

x

: 

y and x = 0; y < 0 and x not an integer.

¦ 

For 

‡

x: x < 0.

¦ 

For 

 or 

: 

x  



  0.

¦ 

For 

: 

x

= 90

¡

, -90

¡

, 270

¡

, -270

¡

, 450

¡

, etc.

¦ 

For 

 or 

:  |

x| > 1.

¦ 

For nCr or nPr: n or r are not integers 

‚

 0.

¦ 

For 

x!:  

 is not an integer between 0 and 69.

— 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.

 — Pressing 

}

 when 

=

.

 — 

value (in 

 stats) < 0 or >99, or not an

integer.

 — Pressing 

m

 or 

o

 when constants are not defined

or while in 

 mode.

 — |

q

| 

‚

 1

¯

10, where 

q

 is an angle in a trig,

hyperbolic, or R

4

Pr( function.

 — 

¦ 

Pressing 

u

 with no defined data points.

¦ 

When not in 

 mode, pressing 

v

, 

u

, or

%

 

w

.

 — The command contains a syntax error: entering

more than 23 pending operations, 8 pending values, or
having misplaced functions, arguments, parentheses, or
commas.

1.  Using a small Phillips screwdriver, remove screws from back

case.

2.  Remove protective cover. Starting from the bottom, carefully

separate front from back. 

 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

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components while changing the battery.

4.  If necessary, press & and - at the same time to reset

the 

TI

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(clears memory and all settings).

Caution: Dispose of old batteries properly. Do not incinerate
batteries or leave where a child can find them.

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

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 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.