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Topic: Storying Data on TI-82/83
Replies: 3   Last Post: Jul 24, 1996 2:21 PM

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Al Coons

Posts: 898
Registered: 12/4/04
Storying Data on TI-82/83
Posted: Jul 20, 1996 10:36 AM
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Below is a text draft (without graphics) of a detailed description of the
advantages of storing data in programs in TI graphing calculators and a
step-by-step explanation of how to accomplish this. Bill Roloff first
described this in a previous email and there seemed to be agreement among
those of us at Fred Djang's AP Stats course (last week - fun and very
productive - thanks Fred) that this was the way to go.


DRAFT
EFFICIENT STORING OF STATISTICAL DATA IN THE TI-82 AND TI-83 FOR AP
STATISTICS

Many AP Statistics courses will utilize TI-82 and/or TI-83 calculators for
analyzing data. While many courses will also use student versions of
statistical software residing on computers, graphing calculators will provide
a consistent tool which students are most likely to have both in class and at
home.

Teachers will use a large number of data sets supplied on disk, downloaded
from the Internet, and created by students. For example, extensive data sets
from textbooks and activity books are often provided by their publishers.
However, data sets are rarely in a form which will load directly into the
statistical lists of the calculators.

Since there will be many more data sets than can be stored in a calculator at
any one time, the data sets must eventually be stored on a computer. Sets
can then be downloaded to a calculator as necessary using the TI-Graph Link.


A BETTER WAY TO STORE DATA

Before transforming data into TI-82/3 formats, an important decision needs to
be made about how the data sets will be stored in the calculator. Students
will need to store more than one data set in a calculator so that a
reasonable number of sets will be available for a few nights homework or to
use class time efficiently.

The traditional method of storing data sets for statistical analysis in the
calculator is to use lists which are then grouped in one file by the TI-Link
software. However, this method has the following disadvantages:

* It is difficult to store more than one or two data sets in the TI-82 at
any given time.

* Data sets which each contain a list with the same name cannot be
maintained in the calculator without changing names.

* If the data in the calculator is corrupted there is no way to reconstruct
it without reloading from either a computer or another TI calculator.

* The TI-83 software for the TI-Graph Link does not allow viewing of grouped
lists before downloading to the computer. (Groups must be ungrouped before
viewing)

However, these disadvantages can be overcome by storing each set of data in a
separate program as explained below (end note 1). An additional advantage of
storing data in programs is that it takes less storage.


STORING DATA IN PROGRAMS IN A TI-83

Note: This section uses features of the TI-83 which are not available on the
TI-82. When teaching in an environment which is either all TI-82 or mixed
TI-82/TI-83 there are advantages in using ONLY the method described in the
section Storing Data In Programs In a TI-82.


The following program stores distance and fare data for an airline (end note
2) in two lists of data named DIST and FARE.

PROGRAM:AIRFARE
SetUpEditor DIST,FARE
{576,370,612,1216,409,1502,946,998,189,787,210,737} -> DIST
{178,138,94,278,158,258,198,188,98,179,138,98} -> FARE

While programs can be entered directly into the calculator, there is an
easier way to enter the actual data:

A. Have the data stored in the TI-83 in lists DIST and FARE

B. Create a new program call AIRFARE:

Press PRGM.
Select NEW. Press ENTER.
Enter AIRFARE. Press ENTER.

C. Enter the SetUpEditor statement:

Press STAT. Select SetUpEditor. Press ENTER.
Press LIST. Select DIST from the list of names.
Press "," (the comma key).
Press LIST. Select FARE from the list of names.
Press ENTER.

Note: "SetUpEditor" forces only the lists DIST and FARE to be displayed in
STAT EDIT after the program is executed. If they do not already exist, empty
lists DIST and FARE will be created.

D. The following steps transfer the actual data from the lists to the
program:

Press RCL.
Press LIST. Select DIST from the list of names.
Rcl LDIST will appear at the bottom of the screen.
Press ENTER. The actual data will be entered into the program.

Press STO->. Press LIST. Select DIST from the list of names. Press ENTER


E. Repeat the process above for the list FARE.

STORING DATA IN PROGRAMS IN A TI-82

The following program stores distance and fare data for an airline (end note
3) in two lists of data named L1 and L2.

PROGRAM:AIRFARE
{576,370,612,1216,409,1502,946,998,189,787,210,737} -> L1
{178,138,94,278,158,258,198,188,98,179,138,98} -> L2

While programs can be entered directly into the calculator, there is an
easier way to enter the actual data:

A. Have the data stored in the TI-82/3 in lists L1 and L2

B. Create a new program call AIRFARE:

Press PRGM.
Select NEW. Press ENTER.
Enter AIRFARE. Press ENTER.

C. The following steps transfer the actual data from the lists to the
program:

Press RCL. Press L1.
Rcl L1 will appear at the bottom of the screen.
Press ENTER. The actual data will be entered into the program.

Press STO->. Press L2. Press ENTER

D. Repeat the process above for the list L2.

------------------------
1 Bill Roloff of Lake Park HS, Rosell, IL suggested this method on the AP
Statistics Listserver.
2 From Workshop Statistics, Allan Rossman
3 From Workshop Statistics, Allan Rossman




Albert Coons
Buckingham Browne & Nichols School
Cambridge, MA 02138
(617) 547-6100 X 264
alcoons@aol.com







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